Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 318	$ 377
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and other amortization	276	279
Amortization of acquisition-related intangible assets	521	553
Amortization of financing costs and debt discounts	13	12
Share-based compensation	66	108
Deferred income taxes	(70)	(57)
Gain on sale of business	0	(431)
(Income) loss from investments in unconsolidated affiliates	(16)	6
Distributions from unconsolidated affiliates	3	11
Non-cash impairment charge	6	0
Other operating activities	(18)	0
Changes in assets and liabilities, net of effects from acquisitions and dispositions:
Trade accounts receivable	(129)	200
Prepaid expenses and other assets	(39)	6
Contract costs	(92)	(96)
Accounts payable and other liabilities	102	(88)
Contract liabilities	11	8
Net cash provided by operating activities	952	888
Cash flows from investing activities:
Capital expenditures, including capitalized software and other intangibles	(234)	(246)
Proceeds from sale of business	0	584
Payments for acquisition of businesses, net of cash acquired	(281)	(110)
Distributions from unconsolidated affiliates	32	36
Purchases of investments	(227)	0
Other investing activities	2	0
Net cash (used in) provided by investing activities	(708)	264
Cash flows from financing activities:
Debt proceeds	2,182	1,832
Debt repayments	(1,725)	(2,040)
Short-term borrowings, net	(56)	7
Proceeds from issuance of treasury stock	43	48
Purchases of treasury stock, including employee shares withheld for tax obligations	(742)	(970)
Distributions paid to noncontrolling interests and redeemable noncontrolling interests	(10)	(26)
Other financing activities	(3)	15
Net cash used in financing activities	(311)	(1,134)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(8)	(17)
Net change in cash, cash equivalents and restricted cash	(75)	1
Cash, cash equivalents and restricted cash, beginning balance	919	933
Cash, cash equivalents and restricted cash, ending balance	$ 844	$ 934