Changes in Accumulated Other Comprehensive (Loss) Income (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	$ 593,000,000	$ 601,000,000	$ 1,679,000,000	$ 1,705,000,000
Interest expense on long-term debt and other	329,000,000	373,000,000	1,026,000,000	1,163,000,000
Other expenses	1,596,000,000	1,691,000,000	4,393,000,000	4,911,000,000
Net Unrealized Investment Gains (Losses) on Investment Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	(21,000,000)	(36,000,000)	(111,000,000)	(109,000,000)
Income tax provision for other non-interest revenue	8,000,000	13,000,000	40,000,000	40,000,000
Other non-interest revenue, net of taxes	(13,000,000)	(23,000,000)	(71,000,000)	(69,000,000)
Increase (decrease) due to amounts reclassified into earnings	(13,000,000)	(23,000,000)	(71,000,000)	(69,000,000)
Foreign Currency Translation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expenses	0	0	8,000,000	0
Income tax benefit for other, net expense	1,000,000	0	(3,000,000)	0
Increase (decrease) due to amounts reclassified into earnings	1,000,000	0	5,000,000	0
Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Increase (decrease) due to amounts reclassified into earnings	$ (12,000,000)	$ (23,000,000)	$ (66,000,000)	$ (69,000,000)