Changes in Accumulated Other Comprehensive (Loss) Income (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	$ 601	$ 577	$ 1,705	$ 1,781
Interest expense on long-term debt and other	373	440	1,163	1,320
Other, net expense	1,618	1,536	4,682	4,685
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	(36)		(109)
Income tax provision for other non-interest revenue	13		40
Other non-interest revenue, net of taxes	$ (23)		$ (69)