Derivative Instruments and Hedging Activities - Maximum Potential Payout/Notional of Credit Protection Sold (Details) - Credit Protection Sold - USD ($) $ in Billions	Jun. 30, 2024	Dec. 31, 2023
Credit Derivatives
Maximum potential payout/notional	$ 364	$ 389
CDS
Credit Derivatives
Maximum potential payout/notional	361	386
CDS protection sold with identical protection purchased	303	330
Single-name CDS
Credit Derivatives
Maximum potential payout/notional	134	136
Single-name CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	95	97
Single-name CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	39	39
Index and basket CDS
Credit Derivatives
Maximum potential payout/notional	227	250
Index and basket CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	108	116
Index and basket CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	119	134
Other credit contracts
Credit Derivatives
Maximum potential payout/notional	3	3
Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	42	42
Less Than 1 (Year) | CDS
Credit Derivatives
Maximum potential payout/notional	42	42
Less Than 1 (Year) | Single-name CDS
Credit Derivatives
Maximum potential payout/notional	25	26
Less Than 1 (Year) | Single-name CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	18	19
Less Than 1 (Year) | Single-name CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	7	7
Less Than 1 (Year) | Index and basket CDS
Credit Derivatives
Maximum potential payout/notional	17	16
Less Than 1 (Year) | Index and basket CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	9	8
Less Than 1 (Year) | Index and basket CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	8	8
Less Than 1 (Year) | Other credit contracts
Credit Derivatives
Maximum potential payout/notional	0	0
1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	79	76
1 - 3 (Years) | CDS
Credit Derivatives
Maximum potential payout/notional	79	76
1 - 3 (Years) | Single-name CDS
Credit Derivatives
Maximum potential payout/notional	44	43
1 - 3 (Years) | Single-name CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	29	29
1 - 3 (Years) | Single-name CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	15	14
1 - 3 (Years) | Index and basket CDS
Credit Derivatives
Maximum potential payout/notional	35	33
1 - 3 (Years) | Index and basket CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	19	19
1 - 3 (Years) | Index and basket CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	16	14
1 - 3 (Years) | Other credit contracts
Credit Derivatives
Maximum potential payout/notional	0	0
3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	211	236
3 - 5 (Years) | CDS
Credit Derivatives
Maximum potential payout/notional	211	236
3 - 5 (Years) | Single-name CDS
Credit Derivatives
Maximum potential payout/notional	54	56
3 - 5 (Years) | Single-name CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	38	39
3 - 5 (Years) | Single-name CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	16	17
3 - 5 (Years) | Index and basket CDS
Credit Derivatives
Maximum potential payout/notional	157	180
3 - 5 (Years) | Index and basket CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	78	85
3 - 5 (Years) | Index and basket CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	79	95
3 - 5 (Years) | Other credit contracts
Credit Derivatives
Maximum potential payout/notional	0	0
Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	32	35
Over 5 (Years) | CDS
Credit Derivatives
Maximum potential payout/notional	29	32
Over 5 (Years) | Single-name CDS
Credit Derivatives
Maximum potential payout/notional	11	11
Over 5 (Years) | Single-name CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	10	10
Over 5 (Years) | Single-name CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	1	1
Over 5 (Years) | Index and basket CDS
Credit Derivatives
Maximum potential payout/notional	18	21
Over 5 (Years) | Index and basket CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	2	4
Over 5 (Years) | Index and basket CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	16	17
Over 5 (Years) | Other credit contracts
Credit Derivatives
Maximum potential payout/notional	$ 3	$ 3