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Variable Interest Entities - Loan Delinquencies and Net Charge-offs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Securitized loans
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	$ 9,338		$ 9,338		$ 13,352
Net liquidation losses	2	$ 126	53	$ 321
Securitized loans \| Commercial and other
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	3,596		3,596		5,958
Net liquidation losses	0	1	21	11
Nonconsolidated entities
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	142,927		142,927		145,770
Nonconsolidated entities \| Commercial and other
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	91,039		91,039		92,351
Prime / Alt-A & option ARMs \| Securitized loans \| Residential mortgage
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	3,748		3,748		4,988
Net liquidation losses	2	76	14	175
Prime / Alt-A & option ARMs \| Nonconsolidated entities \| Residential mortgage
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	40,906		40,906		41,265
Subprime \| Securitized loans \| Residential mortgage
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	1,994		1,994		2,406
Net liquidation losses	0	$ 49	18	$ 135
Subprime \| Nonconsolidated entities \| Residential mortgage
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	$ 10,982		$ 10,982		$ 12,154