Changes in Accumulated Other Comprehensive (Loss) Income (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	$ 567	$ 651	$ 1,104	$ 1,204
Interest expense on long-term debt and other	385	435	790	880
Other, net expense	1,534	1,674	3,064	3,149
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		72
Income tax provision for other non-interest revenue	(13)		(26)
Other non-interest revenue, net of taxes	$ 23		$ 46