Fair Value Option - Gains (Losses) Due to Changes in Instrument-Specific Credit Risk (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Fair Value disclosure
Cumulative pre-tax DVA gain (loss) recognized in AOCI	$ (1,568)		$ (2,439)
Loans and other receivables | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	24	$ 158
Loans and other receivables | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	0
Deposits | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	0
Deposits | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	(7)	(1)
Borrowings | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	(17)
Borrowings | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	$ 878	$ 185