Securities - Realized Gain (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Securities gains and losses
Realized gains		$ 94	$ 76	$ 185	$ 224
Realized losses		(49)	(64)	(87)	(180)
Total credit losses recognized in income		(1)	0	(2)	(2)
Net securities gains	[1]	44	12	96	42
Credit related
Securities gains and losses
Total credit losses recognized in income		0	0	(1)	0
Intent to sell
Securities gains and losses
Total credit losses recognized in income		$ (1)	$ 0	$ (1)	$ (2)

[1] (a)The Firm recognized other-than-temporary impairment (“OTTI”) losses of $1 million for the three months ended June 30, 2015, and $2 million for each of the six months ended June 30, 2015 and 2014. The Firm did not recognize OTTI losses for the three months ended June 30, 2014.