Derivative Instruments and Hedging Activities - Maximum Potential Payout/Notional of Credit Protection Sold (Details) - Credit Protection Sold - USD ($) $ in Billions	Dec. 31, 2021	Dec. 31, 2020
Credit Derivatives
Maximum potential payout/notional	$ 317	$ 223
Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	26	24
1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	64	43
3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	189	117
Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	38	39
CDS
Credit Derivatives
Maximum potential payout/notional	317	223
CDS protection sold with identical protection purchased	278	196
CDS | Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	26	24
CDS | 1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	64	43
CDS | 3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	189	117
CDS | Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	38	39
Single-name CDS
Credit Derivatives
Maximum potential payout/notional	111	105
Single-name CDS | Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	15	16
Single-name CDS | 1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	39	29
Single-name CDS | 3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	46	49
Single-name CDS | Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	11	11
Single-name CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	74	69
Single-name CDS | Investment grade | Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	10	9
Single-name CDS | Investment grade | 1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	26	19
Single-name CDS | Investment grade | 3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	29	32
Single-name CDS | Investment grade | Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	9	9
Single-name CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	37	36
Single-name CDS | Non-investment grade | Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	5	7
Single-name CDS | Non-investment grade | 1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	13	10
Single-name CDS | Non-investment grade | 3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	17	17
Single-name CDS | Non-investment grade | Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	2	2
Index and basket CDS
Credit Derivatives
Maximum potential payout/notional	206	118
Index and basket CDS | Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	11	8
Index and basket CDS | 1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	25	14
Index and basket CDS | 3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	143	68
Index and basket CDS | Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	27	28
Index and basket CDS | Investment grade
Credit Derivatives
Maximum potential payout/notional	134	60
Index and basket CDS | Investment grade | Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	2	2
Index and basket CDS | Investment grade | 1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	11	5
Index and basket CDS | Investment grade | 3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	106	39
Index and basket CDS | Investment grade | Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	15	14
Index and basket CDS | Non-investment grade
Credit Derivatives
Maximum potential payout/notional	72	58
Index and basket CDS | Non-investment grade | Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	9	6
Index and basket CDS | Non-investment grade | 1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	14	9
Index and basket CDS | Non-investment grade | 3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	37	29
Index and basket CDS | Non-investment grade | Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	12	14
Other credit contracts
Credit Derivatives
Maximum potential payout/notional	0	0
Other credit contracts | Less Than 1 (Year)
Credit Derivatives
Maximum potential payout/notional	0	0
Other credit contracts | 1 - 3 (Years)
Credit Derivatives
Maximum potential payout/notional	0	0
Other credit contracts | 3 - 5 (Years)
Credit Derivatives
Maximum potential payout/notional	0	0
Other credit contracts | Over 5 (Years)
Credit Derivatives
Maximum potential payout/notional	$ 0	$ 0