Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net income	$ 1,631	$ 1,654
Adjustments to reconcile net income to cash provided by operating activities:
Gain from sales of businesses	(257)	0
Depreciation of fixed assets	89	77
Amortization and impairment of intangible assets	144	50
Share-based compensation expense	247	226
Deferred income taxes	(122)	(168)
Other, net	(112)	28
Change in assets and liabilities:
Receivables, net	(959)	(704)
Accounts payable and accrued liabilities	(251)	(515)
Accelerating Aon United Program liabilities	61	0
Current income taxes	60	53
Pension, other postretirement and postemployment liabilities	(17)	(3)
Other assets and liabilities	308	433
Cash provided by operating activities	822	1,131
Cash flows from investing activities
Proceeds from investments	146	54
Purchases of investments	(91)	(29)
Net sales of short-term investments - non fiduciary	189	255
Acquisition of businesses, net of cash and funds held on behalf of clients	(2,780)	(8)
Sale of businesses, net of cash and funds held on behalf of clients	352	1
Capital expenditures	(101)	(145)
Cash provided by (used for) investing activities	(2,285)	128
Cash flows from financing activities
Share repurchase	(500)	(1,100)
Proceeds from issuance of shares	27	33
Cash paid for employee taxes on withholding shares	(176)	(216)
Commercial paper issuances, net of repayments	(591)	(217)
Issuance of debt	7,926	744
Repayment of debt	(4,328)	0
Increase in fiduciary liabilities, net of fiduciary receivables	283	999
Cash dividends to shareholders	(269)	(241)
Redeemable and non-redeemable noncontrolling interests, and other financing activities	(108)	(41)
Cash provided by (used for) financing activities	2,264	(39)
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	(202)	203
Net increase in cash and cash equivalents and funds held on behalf of clients	599	1,423
Cash, cash equivalents and funds held on behalf of clients at beginning of period	7,722	7,076
Cash, cash equivalents and funds held on behalf of clients at end of period	8,321	8,499
Reconciliation of cash and cash equivalents and funds held on behalf of clients:
Cash and cash equivalents	974	952
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	38	9
Funds held on behalf of clients	7,309	7,538
Total cash and cash equivalents and funds held on behalf of clients	8,321	8,499
Supplemental disclosures:
Interest paid	256	220
Income taxes paid, net of refunds	$ 553	$ 461