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Changes in Accounting Policies - Cashflows Impact (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net earnings $ 1,294 $ 547 $ 643
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]      
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
As Previously Reported      
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net earnings 1,352 590 651
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]      
Depreciation and amortization 1,391 1,174 669
Amortization of debt issue costs 19 19 11
Gain on sale of assets (62)   (149)
Loss on extinguishment of debt 196    
Stock-based compensation 107 137 98
Deferred income taxes (985) (164) 48
Excess income tax benefit from exercise of stock options   (32) (29)
Other operating activities, net   (2) 4
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:      
Trade receivables (167) 57 (103)
Contract assets 0 0 0
Settlement activity (51) 15 5
Prepaid expenses and other assets (2) (8) (46)
Deferred contract costs (166) (138) (120)
Deferred revenue (6) 182 63
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
Adjustments | ASU 2014-09      
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net earnings (58) (43) (8)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]      
Depreciation and amortization (25) (21) (13)
Amortization of debt issue costs 0 0 0
Gain on sale of assets 0   0
Loss on extinguishment of debt 0    
Stock-based compensation 0 0 0
Deferred income taxes 0 (26) (4)
Excess income tax benefit from exercise of stock options   0 0
Other operating activities, net   0 0
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:      
Trade receivables (65) (15) 35
Contract assets 62 19 (38)
Settlement activity 0 0 0
Prepaid expenses and other assets 0 0 0
Deferred contract costs 13 17 13
Deferred revenue 73 69 15
Accounts payable, accrued liabilities, and other liabilities 0 0 0
Net cash provided by operating activities 0 0 0
Cash flows from investing activities:      
Additions to property and equipment 0 0 0
Additions to computer software 0 0 0
Acquisitions, net of cash acquired 0 0 0
Net proceeds from sale of assets 0 0 0
Other investing activities, net 0 0 0
Net cash provided by (used in) investing activities 0 0 0
Cash flows from financing activities:      
Borrowings 0 0 0
Repayment of borrowings and capital lease obligations 0 0 0
Debt issuance costs 0 0 0
Excess income tax benefit from exercise of stock options 0 0 0
Proceeds from exercise of stock options 0 0 0
Treasury stock activity 0 0 0
Dividends paid 0 0 0
Distributions to Brazilian Venture partner 0 0 0
Other financing activities, net 0 0 0
Net cash (used in) provided by financing activities 0 0 0
Effect of foreign currency exchange rate changes on cash 0 0 0
Net increase (decrease) in cash and cash equivalents 0 0 0
Cash and cash equivalents, beginning of year 0 0 0
Cash and cash equivalents, end of year 0 0 0
Supplemental cash flow information:      
Cash paid for interest 0 0 0
Cash paid for income taxes $ 0 $ 0 $ 0