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Noninterest Revenue and Noninterest Expense - Principal Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Principal transactions revenue
Total trading revenue	$ 3,117	$ 2,731	$ 10,896	$ 9,297
Private equity gains/(losses)	(153)	(10)	(198)	143
Principal transactions	2,964	2,721	10,698	9,440
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	338	649	1,784	2,032
Credit
Principal transactions revenue
Total trading revenue	202	330	1,230	1,288
Foreign exchange
Principal transactions revenue
Total trading revenue	937	681	2,706	2,363
Equity
Principal transactions revenue
Total trading revenue	1,363	915	4,376	3,153
Commodity
Principal transactions revenue
Total trading revenue	$ 277	$ 156	$ 800	$ 461