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Disclosure - Accounts receivable link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - Contract assets and deferred revenue link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - Capitalized contract costs link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - Financial instruments and concentration of credit risks link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - Properties link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - Goodwill and intangible assets link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 0000025 - Disclosure - Other accrued liabilities link:presentationLink link:calculationLink link:definitionLink 0000026 - Disclosure - Employee plans link:presentationLink link:calculationLink link:definitionLink 0000027 - 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Disclosure - Cost-reduction actions - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954492 - Disclosure - Cost-reduction actions - Statement of Income Classifications (Details) link:presentationLink link:calculationLink link:definitionLink 9954493 - Disclosure - Cost-reduction actions - Liabilities and Expected Future Payments Related to Work-Force Reduction Actions (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - Leases and commitments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954495 - Disclosure - Leases and commitments - Components of Lease Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954496 - Disclosure - Leases and commitments - Supplemental Balance Sheet Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954497 - Disclosure - Leases and commitments - Supplemental Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - Leases and commitments - Maturities of Lease Liabilities, Topic 842 (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - Leases and commitments - Maturities of Lease Liabilities, Topic 842 (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - Disclosure - Leases and commitments - Receivables Under Sales-Type Lease (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - Disclosure - Other (expense), net (Details) link:presentationLink link:calculationLink link:definitionLink 9954501 - Disclosure - Income taxes - Total Income (Loss) From Continuing Operations Before Income Taxes and Provision (Benefit) for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9954502 - Disclosure - Income taxes - Reconciliation of the Provision (Benefit) for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9954503 - Disclosure - Income taxes - Significant Portions of Deferred Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954504 - Disclosure - Income taxes - Valuation Allowance (Details) link:presentationLink link:calculationLink link:definitionLink 9954505 - Disclosure - Income taxes - Tax Loss Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 9954505 - Disclosure - Income taxes - Tax Loss Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 9954506 - Disclosure - Income taxes - Tax Credit Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 9954507 - Disclosure - Income taxes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954508 - Disclosure - Income taxes - Cash Paid for Income Taxes, Net of Refunds (Details) link:presentationLink link:calculationLink link:definitionLink 9954509 - Disclosure - Income taxes - Reconciliation of Changes in Unrecognized Tax Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 9954510 - Disclosure - Earnings (loss) per common share (Details) link:presentationLink link:calculationLink link:definitionLink 9954511 - Disclosure - Accounts receivable (Details) link:presentationLink link:calculationLink link:definitionLink 9954512 - Disclosure - Contract assets and deferred revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9954513 - Disclosure - Capitalized contract costs - Summary (Details) link:presentationLink link:calculationLink link:definitionLink 9954514 - Disclosure - Financial instruments and concentration of credit risks - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954515 - Disclosure - Financial instruments and concentration of credit risks - Fair Value of Foreign Exchange Forward Contracts by Balance Sheet Location (Details) link:presentationLink link:calculationLink link:definitionLink 9954516 - Disclosure - Financial instruments and concentration of credit risks - Gains and Losses Recognized on Foreign Exchange Forward Contracts (Details) link:presentationLink link:calculationLink link:definitionLink 9954517 - Disclosure - Properties - Schedule of Components of Properties (Details) link:presentationLink link:calculationLink link:definitionLink 9954518 - Disclosure - Properties (Details) link:presentationLink link:calculationLink link:definitionLink 9954519 - Disclosure - Goodwill and intangible assets - Carrying Value of Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 9954520 - Disclosure - Goodwill and intangible assets - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954521 - Disclosure - Goodwill and intangible assets - Intangible Assets, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9954522 - Disclosure - Goodwill and intangible assets - Schedule of Future Amortization of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954523 - Disclosure - Debt - Components of Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9954523 - Disclosure - Debt - Components of Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9954524 - Disclosure - Debt - Estimated Fair Values of Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9954525 - Disclosure - Debt - Maturities of Long-term Debt, Including Finance Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9954525 - Disclosure - Debt - Maturities of Long-term Debt, Including Finance Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9954526 - Disclosure - Debt - Cash Paid for Interest and Capitalized Interest (Details) link:presentationLink link:calculationLink link:definitionLink 9954527 - Disclosure - Debt - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954528 - Disclosure - Debt - Interest Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954529 - Disclosure - Other accrued liabilities - Summary (Details) link:presentationLink link:calculationLink link:definitionLink 9954530 - Disclosure - Employee plans - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954531 - Disclosure - Employee plans - Summary of Restricted Stock Unit Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954532 - Disclosure - Employee plans - Weighted Average Assumptions for Restricted Stock Units (Details) link:presentationLink link:calculationLink link:definitionLink 9954533 - Disclosure - Employee plans - Funded Status of the Plan and Amounts Recognized in Consolidated Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 9954534 - Disclosure - Employee plans - Schedule of Accumulated and Projected Benefit Obligation in Excess of Plan Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954535 - Disclosure - Employee plans - Components of Net Periodic Benefit Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954536 - 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Disclosure - Litigation and contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9954544 - Disclosure - Stockholders' equity - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954545 - Disclosure - Stockholders' equity - Accumulated Other Comprehensive Loss (Details) link:presentationLink link:calculationLink link:definitionLink 9954546 - Disclosure - Stockholders' equity - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) link:presentationLink link:calculationLink link:definitionLink 9954547 - Disclosure - Stockholders' equity - Changes in Common Stock and Treasury Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9954548 - Disclosure - Segment information - Operations by Segment (Details) link:presentationLink link:calculationLink link:definitionLink 9954549 - Disclosure - Segment information - Customer Revenue by Classes of Similar Products or Services (Details) link:presentationLink link:calculationLink link:definitionLink 9954550 - 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