Derivative Instruments - Outstanding Derivative Instruments With Off-Balance-Sheet Risks (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	$ 309,424	$ 322,099
Fair Value, Asset	16,788	12,965
Fair Value, Liability	17,989	14,454
Change in foreign currency exchange rate adjustment | Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	5,092	5,147
Fair Value, Asset	469	434
Fair Value, Liability	88	125
Fair value hedges: | Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	470	475
Fair Value, Asset	2	1
Fair Value, Liability	23	40
Interest rate contracts
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	73,407
Interest rate contracts | Non-Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	72,592	90,829
Fair Value, Asset	771	636
Fair Value, Liability	1,027	979
Interest rate contracts | Change in foreign currency exchange rate adjustment | Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	370	485
Fair Value, Asset	2	11
Fair Value, Liability	28	47
Interest rate contracts | Fair value hedges: | Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	445	450
Fair Value, Asset	2	1
Fair Value, Liability	23	39
Foreign currency contracts
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	5,117
Foreign currency contracts | Non-Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	370	306
Fair Value, Asset	13	11
Fair Value, Liability	3	6
Foreign currency contracts | Change in foreign currency exchange rate adjustment | Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	4,722	4,662
Fair Value, Asset	467	423
Fair Value, Liability	60	78
Foreign currency contracts | Fair value hedges: | Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	25	25
Fair Value, Asset	0	0
Fair Value, Liability	0	1
Equity market contracts
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	230,861
Equity market contracts | Non-Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	230,861	225,251
Fair Value, Asset	13,816	10,244
Fair Value, Liability	5,952	4,227
Credit contracts
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	39
Credit contracts | Non-Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	39	91
Fair Value, Asset	0	0
Fair Value, Liability	0	0
LPR ceded derivative | Non-Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	0	0
Fair Value, Asset	201	206
Fair Value, Liability	0	0
Reinsurance-related | Non-Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	0	0
Fair Value, Asset	543	493
Fair Value, Liability	0	0
Indexed annuity ceded embedded derivatives | Non-Qualifying Hedges
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	0	0
Fair Value, Asset	973	940
Fair Value, Liability	$ 10,896	$ 9,077