Changes in Accumulated Other Comprehensive (Loss) Income (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	$ 585	$ 567	$ 1,086	$ 1,104
Interest expense on long-term debt and other	352	385	697	790
Other expenses	1,248	1,609	2,797	3,220
Net Unrealized Investment Gains (Losses) on Investment Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for realized (gains) losses into earnings	(29)	(23)	(58)	(46)
Foreign Currency Translation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for realized (gains) losses into earnings	3		4
Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for realized (gains) losses into earnings	(26)	(23)	(54)	(46)
Reclassification out of accumulated other comprehensive income [Member] | Net Unrealized Investment Gains (Losses) on Investment Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	(45)	(36)	(90)	(72)
Income tax provision for other non-interest revenue	16	13	32	26
Other non-interest revenue, net of taxes	(29)	(23)	(58)	(46)
Reclassification out of accumulated other comprehensive income [Member] | Foreign Currency Translation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expenses	6	0	8	0
Income tax benefit for other, net expense	(3)	0	(4)	0
Other, net expense, net of taxes	$ 3	$ 0	$ 4	$ 0