Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Net income	$ 3,263	$ 2,534	$ 2,303
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	82	83	82
Amortization of intangibles	96	123	122
Provision for losses on accounts receivable	14	17	18
Deferred income taxes	13	(31)	46
Stock-based compensation	122	90	78
Gain on dispositions	(11)	(16)	(49)
Accrued legal settlements	0	9	0
Pension settlement charge, net of taxes	0	2	85
Loss on extinguishment of debt	0	279	57
Lease impairment charges	31	120	11
Other	58	110	25
Changes in operating assets and liabilities, net of effect of acquisitions and dispositions:
Accounts receivable	(144)	18	(135)
Prepaid and other current assets	(86)	(85)	(81)
Accounts payable and accrued expenses	38	132	73
Unearned revenue	198	220	256
Other current liabilities	(45)	(15)	(57)
Net change in prepaid/accrued income taxes	(36)	(2)	(41)
Net change in other assets and liabilities	5	(21)	(17)
Cash provided by operating activities	3,598	3,567	2,776
Investing Activities:
Capital expenditures	(35)	(76)	(115)
Acquisitions, net of cash acquired	(99)	(201)	(91)
Proceeds from dispositions	16	18	85
Changes in short-term investments	(2)	19	(10)
Cash used for investing activities	(120)	(240)	(131)
Financing Activities:
Proceeds from issuance of senior notes, net	0	1,276	1,086
Payments on senior notes	0	(1,394)	(868)
Dividends paid to shareholders	(743)	(645)	(560)
Distributions to noncontrolling interest holders, net	(227)	(194)	(143)
Repurchase of treasury shares	0	(1,164)	(1,240)
Exercise of stock options	13	16	40
Employee withholding tax on share-based payments and other	(56)	(61)	(66)
Cash used for financing activities	(1,013)	(2,166)	(1,751)
Effect of exchange rate changes on cash	(82)	75	34
Net change in cash, cash equivalents, and restricted cash	2,383	1,236	928
Cash, cash equivalents, and restricted cash at beginning of year	4,122	2,886	1,958
Cash, cash equivalents, and restricted cash at end of year	6,505	4,122	2,886
Cash paid during the year for:
Interest	130	159	162
Income taxes	$ 883	$ 683	$ 659