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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net earnings $ 164 $ 303 $ 881
Adjustment to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 3,714 2,444 1,420
Amortization of debt issue costs 31 24 17
Acquisition-related financing foreign exchange 0 (125) 0
Asset impairments 136 87 95
Loss (gain) on sale of businesses, investments and other 9 18 50
Loss on extinguishment of debt 0 217 1
Stock-based compensation 283 402 84
Deferred income taxes (206) (109) (116)
Net changes in assets and liabilities, net of effects from acquisitions and foreign currency:      
Trade and other receivables (75) (161) 78
Contract assets (14) 17 (20)
Settlement activity 862 (165) 9
Prepaid expenses and other assets (264) (129) 4
Deferred contract costs (473) (379) (248)
Deferred revenue 58 40 (100)
Accounts payable, accrued liabilities, and other liabilities 217 (74) (162)
Net cash provided by operating activities 4,442 2,410 1,993
Cash flows from investing activities:      
Additions to property and equipment (263) (200) (127)
Additions to software (866) (628) (495)
Acquisitions, net of cash acquired (469) (6,632) 0
Net proceeds from sale of businesses and investments 0 49 (16)
Other investing activities, net 684 (90) (30)
Net cash provided by (used in) investing activities (914) (7,501) (668)
Cash flows from financing activities:      
Borrowings 47,695 33,352 26,371
Repayment of borrowings and other financing obligations (49,067) (24,672) (26,148)
Debt issuance costs 0 (101) (30)
Proceeds from stock issued under stock-based compensation plans 332 161 288
Treasury stock activity (112) (453) (1,255)
Dividends paid (868) (656) (421)
Other financing activities, net (731) (50) (41)
Net cash provided by (used in) financing activities (2,751) 7,581 (1,236)
Effect of foreign currency exchange rate changes on cash 42 18 (51)
Net increase (decrease) in cash and cash equivalents 819 2,508 38
Cash and cash equivalents, beginning of year 3,211 703 665
Cash and cash equivalents, end of year 4,030 3,211 703
Supplemental cash flow information:      
Cash paid for interest 428 332 298
Cash paid for income taxes $ 282 $ 321 $ 503