Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
CASH FLOWS (USED IN)/FROM OPERATING ACTIVITIES
NET INCOME		$ 239	$ 194
Adjustments to reconcile net income to total net cash from operating activities:
Depreciation		54	59
Amortization		48	60
Non-cash restructuring charges		0	11
Non-cash lease expense		25	27
Net periodic cost/(benefit) of defined benefit pension plans		88	(4)
Provision for doubtful receivables from clients		5	8
Benefit from deferred income taxes		(23)	(9)
Share-based compensation		37	24
Gain on disposal of operations		(14)	0
Non-cash foreign exchange loss/(gain)		9	(1)
Other, net		9	8
Changes in operating assets and liabilities, net of effects from purchase of subsidiaries:
Accounts receivable		162	113
Other assets		1	(53)
Other liabilities		(691)	(426)
Provisions		16	13
Net cash (used in)/from operating activities		(35)	24
CASH FLOWS USED IN INVESTING ACTIVITIES
Additions to fixed assets and software		(51)	(60)
Acquisitions of operations, net of cash acquired		(1)	(15)
(Purchase)/sale of investments		(32)	1
Net cash used in investing activities		(84)	(74)
CASH FLOWS FROM FINANCING ACTIVITIES
Senior notes issued		0	746
Debt issuance costs		0	(7)
Repayments of debt		(1)	(1)
Repurchase of shares		(200)	(101)
Net proceeds from fiduciary funds held for clients		315	1,011
Cash paid for employee taxes on withholding shares		(2)	(5)
Dividends paid		(88)	(86)
Acquisitions of and dividends paid to non-controlling interests		0	(1)
Net cash from financing activities		24	1,556
(DECREASE)/INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	[1]	(95)	1,506
Effect of exchange rate changes on cash, cash equivalents and restricted cash		80	(47)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	[1]	4,998	3,792
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	[1]	$ 4,983	$ 5,251

[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.