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Noninterest Revenue and Noninterest Expense - Principal Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Principal transactions revenue
Total trading revenue	$ 3,430	$ 3,117	$ 11,297	$ 10,896
Private equity gains/(losses)	19	(153)	(58)	(198)
Principal transactions	3,449	2,964	11,239	10,698
Corporate
Principal transactions revenue
Private equity gains/(losses)		220
Corporate \| Principal transactions revenue
Principal transactions revenue
Private equity gains/(losses)		170
Corporate \| Other income
Principal transactions revenue
Private equity gains/(losses)		50
Interest rate
Principal transactions revenue
Total trading revenue	835	338	1,901	1,784
Credit
Principal transactions revenue
Total trading revenue	328	202	1,375	1,230
Foreign exchange
Principal transactions revenue
Total trading revenue	892	937	2,509	2,706
Equity
Principal transactions revenue
Total trading revenue	1,003	1,363	4,530	4,376
Commodity
Principal transactions revenue
Total trading revenue	$ 372	$ 277	$ 982	$ 800