Fair Value Option - Gains (Losses) Due to Changes in Instrument-Specific Credit Risk (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value disclosure
Cumulative pre-tax DVA gain (loss) recognized in AOCI	$ 1,034		$ 1,034		$ (2,439)
Loans and other receivables | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	(68)	$ 58	(59)	$ 311
Loans and other receivables | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	0	0	0
Lending commitments | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	(2)	(3)	(3)	(2)
Lending commitments | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	0	0	0
Deposits | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	0	0	0
Deposits | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	(9)	6	5	15
Borrowings | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	(9)	1	(36)
Borrowings | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	$ 1,091	$ 190	$ 3,468	$ 612