Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM/(USED IN) OPERATING ACTIVITIES
NET INCOME		$ 239	$ 922
Adjustments to reconcile net income to total net cash from operating activities:
Depreciation		131	143
Amortization		168	201
Impairment		81	0
Non-cash restructuring charges		49	0
Non-cash lease expense		64	73
Net periodic benefit of defined benefit pension plans		(80)	(81)
Provision for doubtful receivables from clients		12	8
(Benefit from)/provision for deferred income taxes		(45)	56
Share-based compensation		47	52
Net loss/(gain) on disposal of operations		96	(357)
Non-cash foreign exchange gain		(1)	(4)
Other, net		(12)	(12)
Changes in operating assets and liabilities, net of effects from purchase of subsidiaries:
Accounts receivable		180	(39)
Other assets		(111)	(91)
Other liabilities		(573)	(506)
Provisions		13	1
Net cash from operating activities		258	366
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to fixed assets and software for internal use		(60)	(79)
Capitalized software costs		(33)	(27)
Acquisitions of operations, net of cash acquired		(76)	0
Proceeds from sale of operations		0	696
Cash and fiduciary funds transferred in sale of operations		(12)	(216)
Sale of investments		200	0
Net cash from investing activities		19	374
CASH FLOWS USED IN FINANCING ACTIVITIES
Senior notes issued		750	0
Debt issuance costs		(5)	0
Repayments of debt		(583)	(515)
Repurchase of shares		(2,721)	0
Proceeds from issuance of shares		1	2
Net proceeds/(payments) from fiduciary funds held for clients		85	(246)
Payments of deferred and contingent consideration related to acquisitions		(20)	(17)
Cash paid for employee taxes on withholding shares		(5)	(1)
Dividends paid		(189)	(269)
Acquisitions of and dividends paid to non-controlling interests		(3)	(21)
Net cash used in financing activities		(2,690)	(1,067)
DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	[1]	(2,413)	(327)
Effect of exchange rate changes on cash, cash equivalents and restricted cash		(170)	(50)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	[1]	7,691	6,301
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	[1]	$ 5,108	$ 5,924

[1] The amounts of cash, cash equivalents and restricted cash, their respective classification on the condensed consolidated balance sheets, as well as their respective portions of the increase or decrease in cash, cash equivalents and restricted cash for each of the periods presented have been included in Note 19 — Supplemental Disclosures of Cash Flow Information.