Derivative Financial Instruments and Off-balance Sheet Financial Instruments - Schedule of Volume and Fair Value Positions of Derivative Instruments (Details) $ in Millions	Dec. 31, 2024 USD ($) contract	Dec. 31, 2023 USD ($) contract
Derivatives, Fair Value
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, net, Other investments, net	Other assets, net, Other investments, net
Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount	$ 852	$ 562
Total liability derivatives, notional amount	0	325
Total derivatives, notional amount	$ 852	$ 887
Total asset derivatives, number of contracts | contract	5,033	21,816
Total liability derivatives, number of contracts | contract	12,774	3,155
Total derivatives, number of contracts | contract	17,807	24,971
Total asset derivatives, fair value, net	$ 154	$ 118
Total liability derivatives, fair value, net	(1)	(6)
Total derivatives, fair value, net	153	112
Asset derivatives, gross asset	155	123
Liability derivatives, gross asset	0	1
Asset derivatives, gross liability	(1)	(5)
Liability derivatives, gross liability	$ (1)	$ (7)
Interest rate contracts | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract	4,596	20,479
Total liability derivatives, number of contracts | contract	12,112	2,175
Total asset derivatives, fair value, net	$ 0	$ 2
Total liability derivatives, fair value, net	(1)	(1)
Asset derivatives, gross asset	0	2
Liability derivatives, gross asset	0	0
Asset derivatives, gross liability	0	0
Liability derivatives, gross liability	$ (1)	$ (1)
Options | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract		32
Total asset derivatives, fair value, net		$ 0
Asset derivatives, gross asset		0
Asset derivatives, gross liability		$ 0
Futures | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract	437	1,305
Total liability derivatives, number of contracts | contract	662	980
Total asset derivatives, fair value, net	$ 0	$ 1
Total liability derivatives, fair value, net	0	(1)
Asset derivatives, gross asset	0	1
Liability derivatives, gross asset	0	0
Asset derivatives, gross liability	0	0
Liability derivatives, gross liability	0	(1)
Foreign currency forwards | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount	602	278
Total liability derivatives, notional amount		306
Total asset derivatives, fair value, net	20	(2)
Total liability derivatives, fair value, net		(3)
Asset derivatives, gross asset	21	2
Liability derivatives, gross asset		1
Asset derivatives, gross liability	(1)	(4)
Liability derivatives, gross liability		(4)
Contingent consideration | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount	250	250
Total asset derivatives, fair value, net	134	118
Asset derivatives, gross asset	134	118
Asset derivatives, gross liability	$ 0	0
Credit default swaps – buying protection | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount		34
Total liability derivatives, notional amount		19
Total asset derivatives, fair value, net		(1)
Total liability derivatives, fair value, net		(1)
Asset derivatives, gross asset		0
Liability derivatives, gross asset		0
Asset derivatives, gross liability		(1)
Liability derivatives, gross liability		$ (1)