Goodwill and Other Intangible Assets - Schedule of Changes in the Net Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 15,234
Goodwill related to current year acquisitions	476
Goodwill related to current year disposals	(7)
Goodwill related to assets held for sale	(389)
Measurement period adjustments related to prior year acquisitions	(27)
Foreign currency translation and other	417
Ending balance	15,704
Risk Capital
Goodwill [Roll Forward]
Beginning balance	8,785
Goodwill related to current year acquisitions	450
Goodwill related to current year disposals	(7)
Goodwill related to assets held for sale	0
Measurement period adjustments related to prior year acquisitions	(11)
Foreign currency translation and other	280
Ending balance	9,497
Human Capital
Goodwill [Roll Forward]
Beginning balance	6,449
Goodwill related to current year acquisitions	26
Goodwill related to current year disposals	0
Goodwill related to assets held for sale	(389)
Measurement period adjustments related to prior year acquisitions	(16)
Foreign currency translation and other	137
Ending balance	$ 6,207