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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net earnings $ 149 $ 190
Adjustment to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 368 352
Amortization of debt issue costs 4 5
Loss (gain) on sale of businesses and investments 6 (7)
Stock-based compensation 19 20
Deferred income taxes (10) (14)
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:    
Trade and other receivables 13 44
Contract assets (1) 2
Settlement activity (56) 2
Prepaid expenses and other assets (117) (43)
Deferred contract costs (106) (65)
Deferred revenue 110 69
Accounts payable, accrued liabilities, and other liabilities (85) (201)
Net cash provided by operating activities 294 354
Cash flows from investing activities:    
Additions to property and equipment (37) (54)
Additions to computer software (108) (118)
Net proceeds from sale of businesses and investments 43 49
Other investing activities, net (41) (4)
Net cash provided by (used in) investing activities (143) (127)
Cash flows from financing activities:    
Borrowings 5,952 1,971
Repayment of borrowings and other financing obligations (5,754) (1,711)
Proceeds from exercise of stock options 62 98
Treasury stock activity (423) (424)
Dividends paid (113) (106)
Other financing activities, net 1 (1)
Net cash provided by (used in) financing activities (275) (173)
Effect of foreign currency exchange rate changes on cash (3) 6
Net increase (decrease) in cash and cash equivalents (127) 60
Cash and cash equivalents, beginning of period 703 665
Cash and cash equivalents, end of period 576 725
Supplemental cash flow information:    
Cash paid for interest 49 46
Cash paid for income taxes $ 44 $ 138