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Variable Interest Entities - Loan Delinquencies and Liquidation Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Securitized loans
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	$ 5,093		$ 5,531
Net liquidation losses/(recoveries)	0	$ 51
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	1,320		1,456
Net liquidation losses/(recoveries)	6	21
Nonconsolidated entities
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	173,746		150,842
Nonconsolidated entities \| Commercial and other
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	113,255		93,698
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	2,236		2,466
Net liquidation losses/(recoveries)	(6)	12
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	50,727		47,029
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	1,537		1,609
Net liquidation losses/(recoveries)	0	$ 18
Subprime \| Nonconsolidated entities \| Residential mortgage
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	$ 9,764		$ 10,115