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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net earnings $ 571 $ 351
Adjustment to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 1,060 1,015
Amortization of debt issue costs 13 15
Asset impairments 95 0
Loss (gain) on sale of businesses 48 (55)
Loss on extinguishment of debt 1 192
Stock-based compensation 66 86
Deferred income taxes (65) (196)
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:    
Trade receivables 151 (187)
Contract assets (10) 77
Settlement activity (6) (27)
Prepaid expenses and other assets 31 (20)
Deferred contract costs (180) (111)
Deferred revenue (122) (51)
Accounts payable, accrued liabilities, and other liabilities (365) (10)
Net cash provided by operating activities 1,288 1,079
Cash flows from investing activities:    
Additions to property and equipment (115) (98)
Additions to computer software (349) (350)
Proceeds from sale of businesses 58 1,307
Other investing activities, net (26) (3)
Net cash provided by (used in) investing activities (432) 856
Cash flows from financing activities:    
Borrowings 8,068 7,900
Repayment of borrowings and capital lease obligations (7,725) (9,594)
Debt issuance costs (30) (13)
Proceeds from exercise of stock options 273 168
Treasury stock activity (1,038) (46)
Dividends paid (316) (289)
Distribution to Brazilian Venture partner (23) (23)
Other financing activities, net (3) (36)
Net cash provided by (used in) financing activities (794) (1,933)
Effect of foreign currency exchange rate changes on cash (56) 35
Less net change in cash balances classified as assets held for sale (39) 0
Net increase (decrease) in cash and cash equivalents (33) 37
Cash and cash equivalents, beginning of period 665 683
Cash and cash equivalents, end of period 632 720
Supplemental cash flow information:    
Cash paid for interest 199 266
Cash paid for income taxes $ 442 $ 485