Noninterest Revenue - Other Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Revenue Disclosure [Abstract]
Operating lease income	$ 2,081	$ 1,699	$ 1,472
Gain from sale of Visa B shares	$ 0	$ 0	$ 1,310