Fair Value Option - Gains (Losses) Due to Changes in Instrument-Specific Credit Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value disclosure
Cumulative pre-tax DVA gain (loss) recognized in AOCI	$ (2,439)	$ (3,357)
Loans and other receivables | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	0	$ 0
Loans and other receivables | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	278	(116)	223
Lending commitments | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	0	0
Lending commitments | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	2	(3)	(2)
Deposits | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	17	(19)	(30)
Deposits | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	0	0
Borrowings | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	901	(1,340)	(2,140)
Borrowings | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	$ (36)	$ (26)	(11)
Other | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk			0
Other | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk			$ 0