Derivative Financial Instruments - Schedule of Volume and Fair Value Positions of Derivative Instruments (Details) - Derivatives not designated as accounting hedging instruments $ in Millions	Jun. 30, 2024 USD ($) contract	Dec. 31, 2023 USD ($) contract
Derivatives, Fair Value
Total asset derivatives, notional amount	$ 250	$ 562
Total liability derivatives, notional amount	646	325
Total derivatives, notional amount	$ 896	$ 887
Total asset derivatives, number of contracts | contract	4,758	21,816
Total liability derivatives, number of contracts | contract	10,806	3,155
Total derivatives, Number of contracts | contract	15,564	24,971
Net amount on balance sheet	$ 123	$ 118
Net amount on balance sheet	2	(6)
Total derivatives, fair value, net	125	112
Asset derivatives, gross asset	123	123
Liability derivatives, gross asset	7	1
Asset derivatives, gross liability	0	(5)
Liability derivatives gross liability	$ (5)	$ (7)
Interest rate contracts
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract	3,538	20,479
Total liability derivatives, number of contracts | contract	10,307	2,175
Net amount on balance sheet	$ 1	$ 2
Net amount on balance sheet	(2)	(1)
Asset derivatives, gross asset	1	2
Liability derivatives, gross asset	0	0
Asset derivatives, gross liability	0	0
Liability derivatives gross liability	$ (2)	$ (1)
Options
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract	28	32
Total liability derivatives, number of contracts | contract	17
Net amount on balance sheet	$ 0	$ 0
Net amount on balance sheet	0
Asset derivatives, gross asset	0	0
Liability derivatives, gross asset	0
Asset derivatives, gross liability	0	$ 0
Liability derivatives gross liability	$ 0
Futures
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract	1,192	1,305
Total liability derivatives, number of contracts | contract	482	980
Net amount on balance sheet	$ 1	$ 1
Net amount on balance sheet	(1)	(1)
Asset derivatives, gross asset	1	1
Liability derivatives, gross asset	0	0
Asset derivatives, gross liability	0	0
Liability derivatives gross liability	(1)	(1)
Foreign currency contracts
Derivatives, Fair Value
Total asset derivatives, notional amount		278
Total liability derivatives, notional amount	616	306
Net amount on balance sheet		(2)
Net amount on balance sheet	5	(3)
Asset derivatives, gross asset		2
Liability derivatives, gross asset	7	1
Asset derivatives, gross liability		(4)
Liability derivatives gross liability	(2)	(4)
Contingent consideration
Derivatives, Fair Value
Total asset derivatives, notional amount	250	250
Net amount on balance sheet	121	118
Asset derivatives, gross asset	121	118
Asset derivatives, gross liability	0	0
Credit default contracts
Derivatives, Fair Value
Total asset derivatives, notional amount		34
Total liability derivatives, notional amount	30	19
Net amount on balance sheet		(1)
Net amount on balance sheet	0	(1)
Asset derivatives, gross asset		0
Liability derivatives, gross asset	0	0
Asset derivatives, gross liability		(1)
Liability derivatives gross liability	$ 0	$ (1)