Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating cash flows:
Net income before non-controlling interests	$ 3,174	$ 2,046	$ 1,773
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software	382	390	333
Amortization of intangible assets	365	351	314
Non cash lease expense	327	355	315
Adjustments and payments related to contingent consideration assets and liabilities	27	(22)	27
Gain on consolidation of entity	(267)	0	0
Charge for early extinguishment of debt	0	0	32
(Benefit) provision for deferred income taxes	(63)	40	84
Net (gain) loss on investments	(61)	22	(22)
Net (gain) loss on disposition of assets	(33)	24	56
Share-based compensation expense	348	290	252
Change in fair value of acquisition-related derivative contracts	0	0	8
Changes in assets and liabilities:
Net receivables	(252)	(75)	(130)
Other current assets	(166)	(66)	(13)
Other assets	(215)	86	(1)
Accounts payable and accrued liabilities	225	241	120
Accrued compensation and employee benefits	527	207	154
Accrued income taxes	(45)	60	42
Contributions to pension and other benefit plans in excess of current year credit	(372)	(356)	(369)
Other liabilities	2	108	(172)
Operating lease liabilities	(349)	(351)	(327)
Effect of exchange rate changes	(38)	32	(115)
Net cash provided by operations	3,516	3,382	2,361
Financing cash flows:
Purchase of treasury shares	(1,159)	0	(485)
Borrowings from term-loan and credit facilities	0	1,000	300
Proceeds from issuance of debt	743	737	6,459
Repayments of debt	(1,016)	(2,515)	(1,064)
Payments for early extinguishment of debt	0	0	(585)
Purchase of non-controlling interests	0	(3)	(80)
Acquisition-related derivative payments	0	0	(337)
Shares withheld for taxes on vested units – treasury shares	(101)	(132)	(89)
Issuance of common stock from treasury shares	161	132	158
Payments of deferred and contingent consideration for acquisitions	(117)	(122)	(65)
Receipts of contingent consideration for dispositions	71	0	0
Distributions of non-controlling interests	(36)	(34)	(16)
Dividends paid	(1,026)	(943)	(890)
Change in fiduciary liabilities	1,183	955	1,025
Net cash (used for) provided by financing activities	(1,297)	(925)	4,331
Investing cash flows:
Capital expenditures	(406)	(348)	(421)
Net sales (purchases) of long-term investments	18	107	183
Purchase of equity investment	(5)	0	(91)
Dispositions	84	98	229
Acquisitions, net of cash and cash held in a fiduciary capacity acquired	(859)	(647)	(4,229)
Other, net	4	(3)	(66)
Net cash used for investing activities	(1,164)	(793)	(4,395)
Effect of exchange rate changes on cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity	(355)	511	135
Increase in cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity	700	2,175	2,432
Cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity at beginning of year	10,674	8,499	6,067
Cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity at end of year	11,374	10,674	8,499
Cash and cash equivalents	1,752	2,089	1,155
Cash and cash equivalents held in a fiduciary capacity	9,622	8,585	7,344
Total cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity	$ 11,374	$ 10,674	$ 8,499