Non-U.S. Activities (Summary Of Non-U.S. Assets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Interest-bearing deposits with banks	$ 98,386	$ 64,257
Other assets	26,574	25,990
Total assets	282,324	243,291
Non-U.S. Assets
Segment Reporting Information [Line Items]
Interest-bearing deposits with banks	15,969	9,584
Investment securities	32,642	31,522
Other assets	16,111	16,778
Total assets	$ 64,722	$ 57,884