Commitments, Guarantees and Contingencies - Obligations under Guarantee Arrangements (Details) $ in Millions	Jun. 30, 2024 USD ($)
Non-credit derivatives
Guarantees
Carrying Amount Asset (Liability)	$ (37,812)
Non-credit derivatives | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	1,286,435
Non-credit derivatives | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	748,523
Non-credit derivatives | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	169,086
Non-credit derivatives | Over 5 (Years)
Guarantees
Maximum potential payout/notional	454,869
Standby letters of credit and other financial guarantees issued
Guarantees
Carrying Amount Asset (Liability)	5
Standby letters of credit	700
Allowance for credit loss	64
Standby letters of credit and other financial guarantees issued | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	1,667
Standby letters of credit and other financial guarantees issued | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	1,262
Standby letters of credit and other financial guarantees issued | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	1,073
Standby letters of credit and other financial guarantees issued | Over 5 (Years)
Guarantees
Maximum potential payout/notional	2,556
Liquidity facilities
Guarantees
Carrying Amount Asset (Liability)	2
Liquidity facilities | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	2,196
Liquidity facilities | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	0
Liquidity facilities | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	0
Liquidity facilities | Over 5 (Years)
Guarantees
Maximum potential payout/notional	0
Whole loan sales guarantees
Guarantees
Carrying Amount Asset (Liability)	0
Whole loan sales guarantees | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	3
Whole loan sales guarantees | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	83
Whole loan sales guarantees | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	0
Whole loan sales guarantees | Over 5 (Years)
Guarantees
Maximum potential payout/notional	23,074
Securitization representations and warranties
Guarantees
Carrying Amount Asset (Liability)	(3)
Securitization representations and warranties | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	0
Securitization representations and warranties | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	0
Securitization representations and warranties | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	0
Securitization representations and warranties | Over 5 (Years)
Guarantees
Maximum potential payout/notional	83,563
General partner guarantees
Guarantees
Carrying Amount Asset (Liability)	(91)
General partner guarantees | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	299
General partner guarantees | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	32
General partner guarantees | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	133
General partner guarantees | Over 5 (Years)
Guarantees
Maximum potential payout/notional	28
Client clearing guarantees
Guarantees
Carrying Amount Asset (Liability)	0
Client clearing guarantees | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	184
Client clearing guarantees | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	0
Client clearing guarantees | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	0
Client clearing guarantees | Over 5 (Years)
Guarantees
Maximum potential payout/notional	$ 0