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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 1,187 $ 1,246 $ 930
Adjustment for discontinued operations 0 (14) 0
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:      
Depreciation and other amortization 393 285 263
Amortization of acquisition-related intangible assets 163 159 158
Share-based compensation 73 63 68
Excess tax benefits from share-based awards 0 0 (51)
Deferred income taxes 133 (247) 21
Gain on sale of businesses (227) (10) 0
Loss on early debt extinguishment 14 0 0
Income from investments in unconsolidated affiliates (10) (32) (147)
Dividends from unconsolidated affiliates 2 45 151
Non-cash impairment charges 3 18 17
Other operating activities (10) (4) (2)
Changes in assets and liabilities, net of effects from acquisitions and dispositions:      
Trade accounts receivable (108) (75) (88)
Prepaid expenses and other assets (6) (37) (64)
Contract costs (137) (29) (14)
Accounts payable and other liabilities 116 54 172
Contract liabilities (34) 61 17
Net cash provided by operating activities from continuing operations 1,552 1,483 1,431
Cash flows from investing activities:      
Capital expenditures, including capitalization of software costs (360) (287) (290)
Proceeds from sale of businesses 419 17 0
Payments for acquisitions of businesses, net of cash acquired (712) (384) (265)
Purchases of investments (3) (10) (1)
Other investing activities (7) 7 2
Net cash used in investing activities from continuing operations (663) (657) (554)
Cash flows from financing activities:      
Debt proceeds 5,039 2,310 2,126
Debt repayments, including redemption and other costs (4,005) (1,985) (1,863)
Proceeds from issuance of treasury stock 75 78 79
Purchases of treasury stock, including employee shares withheld for tax obligations (1,946) (1,223) (1,245)
Excess tax benefits from share-based awards 0 0 51
Other financing activities (5) 0 0
Net cash used in financing activities from continuing operations (842) (820) (852)
Net change in cash and cash equivalents from continuing operations 47 6 25
Net change in cash and cash equivalents from discontinued operations 43 19 0
Cash and cash equivalents, beginning balance 325 300 275
Cash and cash equivalents, ending balance 415 325 300
Net Cash Provided by (Used in) Discontinued Operations [Abstract]      
Net cash (used in) provided by operating activities (7) 19 0
Net cash provided by investing activities 50 0 0
Net change in cash and cash equivalents from discontinued operations $ 43 $ 19 $ 0