Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 602	$ 386
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and other amortization	560	550
Amortization of acquisition-related intangible assets	1,050	1,099
Amortization of financing costs and debt discounts	25	24
Share-based compensation	127	202
Deferred income taxes	(69)	(94)
Gain on sale of business	0	(428)
(Income) loss from investments in unconsolidated affiliates	(58)	16
Distributions from unconsolidated affiliates	13	12
Non-cash impairment charges	5	40
Other operating activities	(22)	(3)
Changes in assets and liabilities, net of effects from acquisitions and dispositions:
Trade accounts receivable	(154)	278
Prepaid expenses and other assets	(56)	62
Contract costs	(150)	(158)
Accounts payable and other liabilities	171	(54)
Contract liabilities	(31)	(13)
Net cash provided by operating activities	2,013	1,919
Cash flows from investing activities:
Capital expenditures, including capitalized software and other intangibles	(494)	(488)
Proceeds from sale of business	0	584
Payments for acquisition of businesses, net of cash acquired	(493)	(136)
Distributions from unconsolidated affiliates	52	66
Purchases of investments	(235)	0
Proceeds from sale of investments	472	0
Net cash (used in) provided by investing activities	(698)	26
Cash flows from financing activities:
Debt proceeds	4,343	5,812
Debt repayments	(5,415)	(6,219)
Net proceeds from (repayments of) commercial paper and short-term borrowings	1,047	(1)
Payments of debt financing costs	0	(16)
Proceeds from issuance of treasury stock	60	86
Purchases of treasury stock, including employee shares withheld for tax obligations	(1,361)	(1,574)
Distributions paid to noncontrolling interests and redeemable noncontrolling interests	(21)	(52)
Payments of acquisition-related contingent consideration	(28)	0
Other financing activities	(2)	5
Net cash used in financing activities	(1,377)	(1,959)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2)	(12)
Net change in cash, cash equivalents and restricted cash	(64)	(26)
Cash, cash equivalents and restricted cash, beginning balance	919	933
Cash, cash equivalents and restricted cash, ending balance	$ 855	$ 907