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Changes in Accounting Policies - Cash Flow Impact (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:        
Net earnings $ 218 $ 147 $ 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 assets     (6) (88)
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       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)
Net proceeds from sale of assets     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)
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 $ 683 786 683 786
Supplemental cash flow information:        
Cash paid for interest     146 195
Cash paid for income taxes     353 452
As Previously Reported        
Cash flows from operating activities:        
Net earnings   140   284
Adjustment to reconcile net earnings to net cash provided by operating activities:        
Depreciation and amortization       685
Amortization of debt issue costs       17
Gain on sale of assets       (88)
Stock-based compensation       61
Deferred income taxes       (132)
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:        
Trade receivables       45
Contract assets       0
Settlement activity       (19)
Prepaid expenses and other assets       (52)
Deferred contract costs       (70)
Deferred revenues       9
Accounts payable, accrued liabilities, and other liabilities       (212)
Net cash provided by operating activities       528
Cash flows from investing activities:        
Additions to property and equipment       (69)
Additions to computer software       (228)
Net proceeds from sale of assets       846
Other investing activities, net       (3)
Net cash provided by (used in) investing activities       546
Cash flows from financing activities:        
Borrowings       3,698
Repayment of borrowings       (4,557)
Proceeds from exercise of stock options       109
Treasury stock activity       (43)
Dividends paid       (192)
Other financing activities, net       (5)
Net cash provided by (used in) financing activities       (990)
Effect of foreign currency exchange rate changes on cash       19
Net increase (decrease) in cash and cash equivalents       103
Cash and cash equivalents, beginning of period     665 683
Cash and cash equivalents, end of period   786   786
Supplemental cash flow information:        
Cash paid for interest       195
Cash paid for income taxes       452
Adjustments | ASU 2014-09        
Cash flows from operating activities:        
Net earnings   7   (1)
Adjustment to reconcile net earnings to net cash provided by operating activities:        
Depreciation and amortization       (12)
Amortization of debt issue costs       0
Gain on sale of assets       0
Stock-based compensation       0
Deferred income taxes       2
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:        
Trade receivables       (50)
Contract assets       51
Settlement activity       0
Prepaid expenses and other assets       0
Deferred contract costs       6
Deferred revenues       9
Accounts payable, accrued liabilities, and other liabilities       (5)
Net cash provided by operating activities       0
Cash flows from investing activities:        
Additions to property and equipment       0
Additions to computer software       0
Net proceeds from sale of assets       0
Other investing activities, net       0
Net cash provided by (used in) investing activities       0
Cash flows from financing activities:        
Borrowings       0
Repayment of borrowings       0
Proceeds from exercise of stock options       0
Treasury stock activity       0
Dividends paid       0
Other financing activities, net       0
Net cash provided by (used in) financing activities       0
Effect of foreign currency exchange rate changes on cash       0
Net increase (decrease) in cash and cash equivalents       0
Cash and cash equivalents, beginning of period     $ 0 0
Cash and cash equivalents, end of period   $ 0   0
Supplemental cash flow information:        
Cash paid for interest       0
Cash paid for income taxes       $ 0