Non-U.S. Activities - Summary Of Non-U.S. Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Interest-bearing deposits with banks	$ 116,728	$ 93,523
Other assets	36,909	32,600
Total assets	294,571	274,119
Non- U.S.
Segment Reporting Information [Line Items]
Interest-bearing deposits with banks	32,219	17,382
Investment securities	25,797	29,060
Other assets	14,524	13,577
Total assets	$ 72,540	$ 60,019