Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in the Net Carrying Amount of Goodwill by Operating Segment

The changes in the net carrying amount of goodwill for the three months ended March 31, 2026 are as follows (in millions):

	Risk Capital		Human Capital		Total
Balance as of December 31, 2025	$	9,551	$	6,246	$	15,797
Goodwill related to current year acquisitions	190		—		190
Foreign currency translation and other	(38)		(24)		(62)
Balance as of March 31, 2026	$	9,703	$	6,222	$	15,925

Schedule of Other Intangible Assets by Asset Class

Other intangible assets by asset class are as follows (in millions):

	March 31, 2026						December 31, 2025
	Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount
Customer-related and contract-based	$	7,974	$	2,760	$	5,214	$	7,738	$	2,644	$	5,094
Tradenames	718		139		579		716		121		595
Technology and other	367		334		33		369		331		38
Total	$	9,059	$	3,233	$	5,826	$	8,823	$	3,096	$	5,727

Schedule of Estimated Future Amortization Expense on Intangible Assets

The estimated future amortization for finite-lived intangible assets as of March 31, 2026 is as follows (in millions):

Remainder of 2026	$	523
2027	652
2028	597
2029	549
2030	500
2031	450
Thereafter	2,555
Total	$	5,826