Changes in Accumulated Other Comprehensive (Loss) Income (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	$ 537	$ 553
Interest expense on long-term debt and other	405	445
Other, net expense	1,530	1,475
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)
Income tax provision for other non-interest revenue	13
Other non-interest revenue, net of taxes	$ (23)