Goodwill and Other Intangible Assets - Schedule of Changes in the Net Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Balance at the beginning of the period	$ 8,414	$ 8,292
Goodwill related to current year acquisitions	7,125	23
Goodwill related to current year disposals	(82)	(1)
Foreign currency translation and other	(223)	100
Balance at the end of the period	15,234	8,414
Risk Capital
Goodwill [Roll Forward]
Balance at the beginning of the period	6,227	6,127
Goodwill related to current year acquisitions	2,768	20
Goodwill related to current year disposals	(50)	(1)
Foreign currency translation and other	(160)	81
Balance at the end of the period	8,785	6,227
Human Capital
Goodwill [Roll Forward]
Balance at the beginning of the period	2,187	2,165
Goodwill related to current year acquisitions	4,357	3
Goodwill related to current year disposals	(32)	0
Foreign currency translation and other	(63)	19
Balance at the end of the period	$ 6,449	$ 2,187