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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net earnings $ 1,294 $ 547 $ 643
Adjustment to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 1,366 1,153 656
Amortization of debt issue costs 19 19 11
Gain on sale of assets (62) 0 (149)
Loss on extinguishment of debt 196 0 0
Stock-based compensation 107 137 98
Deferred income taxes (985) (190) 44
Excess income tax benefit from exercise of stock options 0 (32) (29)
Other operating activities, net 0 (2) 4
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:      
Trade receivables (232) 42 (68)
Contract assets 62 19 (38)
Settlement activity (51) 15 5
Prepaid expenses and other assets (2) (8) (46)
Deferred contract costs (153) (121) (107)
Deferred revenue 67 251 78
Accounts payable, accrued liabilities, and other liabilities 115 95 29
Net cash provided by operating activities 1,741 1,925 1,131
Cash flows from investing activities:      
Additions to property and equipment (145) (145) (133)
Additions to computer software (468) (471) (282)
Acquisitions, net of cash acquired 0 0 (1,720)
Net proceeds from sale of assets 1,307 0 241
Other investing activities, net (4) (3) (4)
Net cash provided by (used in) investing activities 690 (619) (1,898)
Cash flows from financing activities:      
Borrowings 9,615 7,745 13,216
Repayment of borrowings and capital lease obligations (11,689) (8,749) (11,561)
Debt issuance costs (13) (25) (37)
Excess income tax benefit from exercise of stock options 0 32 29
Proceeds from exercise of stock options 208 112 57
Treasury stock activity (153) (40) (320)
Dividends paid (385) (341) (305)
Distributions to Brazilian Venture partner (23) (20) (24)
Other financing activities, net (40) (23) (40)
Net cash (used in) provided by financing activities (2,480) (1,309) 1,015
Effect of foreign currency exchange rate changes on cash 31 4 (59)
Net increase (decrease) in cash and cash equivalents (18) 1 189
Cash and cash equivalents, beginning of year 683 682 493
Cash and cash equivalents, end of year 665 683 682
Supplemental cash flow information:      
Cash paid for interest 354 351 142
Cash paid for income taxes $ 545 $ 341 $ 355