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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 225 $ 423
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:    
Depreciation and other amortization 100 93
Amortization of acquisition-related intangible assets 45 40
Amortization of financing costs and debt discounts 60 1
Share-based compensation 19 19
Deferred income taxes 8 77
Gain on sale of business (10) (232)
Loss from investments in unconsolidated affiliates 2 0
Other operating activities (2) 0
Changes in assets and liabilities, net of effects from acquisitions and dispositions:    
Trade accounts receivable 6 67
Prepaid expenses and other assets (26) (44)
Contract costs (58) (50)
Accounts payable and other liabilities (26) 38
Contract liabilities 30 (60)
Net cash provided by operating activities from continuing operations 373 372
Cash flows from investing activities:    
Capital expenditures, including capitalization of software costs (98) (77)
Proceeds from sale of business 0 419
Payments for acquisition of business, including working capital adjustments 56 0
Purchases of investments 0 (1)
Other investing activities 6 (10)
Net cash (used in) provided by investing activities from continuing operations (36) 331
Cash flows from financing activities:    
Debt proceeds 587 509
Debt repayments (680) (806)
Payments of debt financing, redemption and other costs (56) 0
Proceeds from issuance of treasury stock 32 28
Purchases of treasury stock, including employee shares withheld for tax obligations (183) (427)
Net cash used in financing activities from continuing operations (300) (696)
Net change in cash and cash equivalents from continuing operations 37 7
Net cash flows from discontinued operations provided by investing activities 0 50
Cash and cash equivalents, beginning balance 415 325
Cash and cash equivalents, ending balance $ 452 $ 382