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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net earnings $ 190 $ 135
Adjustment to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 352 332
Amortization of debt issue costs 5 12
Gain on sale of businesses (7) (85)
Stock-based compensation 20 26
Deferred income taxes (14) (152)
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:    
Trade receivables 44 11
Contract assets 2 57
Settlement activity 2 (36)
Prepaid expenses and other assets (43) (50)
Deferred contract costs (65) (36)
Deferred revenue 69 96
Accounts payable, accrued liabilities, and other liabilities (201) 144
Net cash provided by operating activities 354 454
Cash flows from investing activities:    
Additions to property and equipment (54) (44)
Additions to computer software (118) (111)
Proceeds from sale of business 49 827
Other investing activities, net (4) (1)
Net cash provided by (used in) investing activities (127) 671
Cash flows from financing activities:    
Borrowings 1,971 1,381
Repayment of borrowings (1,711) (2,443)
Proceeds from exercise of stock options 98 64
Treasury stock activity (424) (17)
Dividends paid (106) (95)
Other financing activities, net (1) (4)
Net cash used in financing activities (173) (1,114)
Effect of foreign currency exchange rate changes on cash 6 11
Net increase in cash and cash equivalents 60 22
Cash and cash equivalents, beginning of period 665 683
Cash and cash equivalents, end of period 725 705
Supplemental cash flow information:    
Cash paid for interest 46 59
Cash paid for income taxes $ 138 $ 55