Fair Value Option - Gains (Losses) Due to Changes in Instrument-Specific Credit Risk (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Fair Value disclosure
Cumulative pre-tax DVA gain (loss) recognized in AOCI	$ (48)		$ (48)		$ (2,439)
Loans and other receivables | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	(15)	$ 95	9	$ 253
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	(1)	1	(1)	1
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	21	10	14	9
Borrowings | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	1	(10)	1	(27)
Borrowings | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	$ 1,499	$ 237	$ 2,377	$ 422