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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net earnings $ 881,000,000 $ 1,294,000,000 $ 547,000,000
Adjustment to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 1,420,000,000 1,366,000,000 1,153,000,000
Amortization of debt issue costs 17,000,000 19,000,000 19,000,000
Asset impairments 95,000,000 0 0
Loss (gain) on sale of businesses and investments 50,000,000 (62,000,000) 0
Loss on extinguishment of debt 1,000,000 196,000,000 0
Stock-based compensation 84,000,000 107,000,000 137,000,000
Deferred income taxes (116,000,000) (985,000,000) (190,000,000)
Excess income tax benefit from exercise of stock options 0 0 (32,000,000)
Other operating activities, net 0 0 (2,000,000)
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:      
Trade and other receivables 78,000,000 (232,000,000) 42,000,000
Contract assets (20,000,000) 62,000,000 19,000,000
Settlement activity 9,000,000 (51,000,000) 15,000,000
Prepaid expenses and other assets 4,000,000 (2,000,000) (8,000,000)
Deferred contract costs (248,000,000) (153,000,000) (121,000,000)
Deferred revenue (100,000,000) 67,000,000 251,000,000
Accounts payable, accrued liabilities, and other liabilities (162,000,000) 115,000,000 95,000,000
Net cash provided by operating activities 1,993,000,000 1,741,000,000 1,925,000,000
Cash flows from investing activities:      
Additions to property and equipment (127,000,000) (145,000,000) (145,000,000)
Additions to computer software (495,000,000) (468,000,000) (471,000,000)
Net proceeds from sale of businesses and investments (16,000,000)    
Net proceeds from sale of businesses and investments   1,307,000,000 0
Other investing activities, net (30,000,000) (4,000,000) (3,000,000)
Net cash provided by (used in) investing activities (668,000,000) 690,000,000 (619,000,000)
Cash flows from financing activities:      
Borrowings 26,371,000,000 9,615,000,000 7,745,000,000
Repayment of borrowings and capital lease obligations (26,148,000,000) (11,689,000,000) (8,749,000,000)
Debt issuance costs (30,000,000) (13,000,000) (25,000,000)
Excess income tax benefit from exercise of stock options   0 32,000,000
Proceeds from exercise of stock options 288,000,000 208,000,000 112,000,000
Treasury stock activity (1,255,000,000) (153,000,000) (40,000,000)
Dividends paid (421,000,000) (385,000,000) (341,000,000)
Distributions to Brazilian Venture partner (26,000,000) (23,000,000) (20,000,000)
Other financing activities, net (15,000,000) (40,000,000) (23,000,000)
Net cash provided by (used in) financing activities (1,236,000,000) (2,480,000,000) (1,309,000,000)
Effect of foreign currency exchange rate changes on cash (51,000,000) 31,000,000 4,000,000
Net increase (decrease) in cash and cash equivalents 38,000,000 (18,000,000) 1,000,000
Cash and cash equivalents, beginning of year 665,000,000 683,000,000 682,000,000
Cash and cash equivalents, end of year 703,000,000 665,000,000 683,000,000
Supplemental cash flow information:      
Cash paid for interest 298,000,000 354,000,000 351,000,000
Cash paid for income taxes $ 503,000,000 $ 545,000,000 $ 341,000,000