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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Fair Value disclosure
Cumulative pre-tax DVA gain (loss) recognized in AOCI	$ (2,545)		$ (2,545)		$ (2,166)
Loans and other receivables | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	$ 0	0	$ 0
Loans and other receivables | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	(24)	(61)	2	(104)
Lending commitments | 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	0	(1)	11
Deposits | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	15	(76)	11	17
Deposits | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	0	0	0	0
Borrowings | OCI
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	347	(625)	(390)	(742)
Borrowings | Trading revenues
Fair Value disclosure
Gains (losses) due to changes in instrument-specific credit risk	$ (7)	$ (3)	$ (17)	$ (9)