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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net earnings $ 408 $ 283
Adjustment to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 706 673
Amortization of debt issue costs 9 17
Gain on sale of businesses (6) (88)
Loss on extinguishment of debt 1 0
Stock-based compensation 45 61
Deferred income taxes (24) (130)
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:    
Trade receivables 189 (5)
Contract assets (3) 51
Settlement activity 13 (19)
Prepaid expenses and other assets (11) (52)
Deferred contract costs (119) (64)
Deferred revenues (2) 18
Accounts payable, accrued liabilities, and other liabilities (383) (217)
Net cash provided by operating activities 823 528
Cash flows from investing activities:    
Additions to property and equipment (83) (69)
Additions to computer software (233) (228)
Proceeds from sale of business 49 846
Other investing activities, net (6) (3)
Net cash provided by (used in) investing activities (273) 546
Cash flows from financing activities:    
Borrowings 5,703 3,698
Repayment of borrowings (5,521) (4,557)
Debt issuance costs (24) 0
Proceeds from exercise of stock options 203 109
Treasury stock activity (637) (43)
Dividends paid (211) (192)
Other financing activities, net (2) (5)
Net cash provided by (used in) financing activities (489) (990)
Effect of foreign currency exchange rate changes on cash (43) 19
Net increase (decrease) in cash and cash equivalents 18 103
Cash and cash equivalents, beginning of period 665 683
Cash and cash equivalents, end of period 683 786
Supplemental cash flow information:    
Cash paid for interest 146 195
Cash paid for income taxes $ 353 $ 452