Non-U.S. Activities (Summary Of Non-U.S. Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Interest-bearing deposits with banks	$ 86,946	$ 64,257
Other assets	34,145	25,990
Total assets	274,805	243,291
Non- U.S.
Segment Reporting Information [Line Items]
Interest-bearing deposits with banks	9,828	9,584
Investment securities	30,791	31,522
Other assets	17,326	16,778
Total assets	$ 57,945	$ 57,884