Derivative Instruments - Maturity of the Notional Amounts of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	$ 196,178
1 – 5 Years	54,521
6 - 10 Years	31,636
11 - 30 Years	24,342
Over 30 Years	5,043
Total	311,720	$ 324,318
Interest rate contracts
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	9,795
1 – 5 Years	19,247
6 - 10 Years	22,649
11 - 30 Years	22,347
Over 30 Years	1,213
Total	75,251
Foreign currency contracts
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	356
1 – 5 Years	1,007
6 - 10 Years	1,725
11 - 30 Years	1,987
Over 30 Years	42
Total	5,117
Equity market contracts
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	186,027
1 – 5 Years	34,228
6 - 10 Years	7,262
11 - 30 Years	8
Over 30 Years	3,788
Total	231,313
Credit contracts
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	0
1 – 5 Years	39
6 - 10 Years	0
11 - 30 Years	0
Over 30 Years	0
Total	$ 39