Assets and Liabilities of Businesses Held For Sale and Discontinued Operations (Discontinued Operations Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Operations
Benefit (provision) for income taxes	$ (82)	$ (215)
Earnings (loss) from discontinued operations, net of taxes	(109)	(197)
Disposal
Earnings (loss) from discontinued operations, net of taxes	(109)	(197)
Assets
Loans and leases receivable, Gross	263,683		273,936
All other assets	58,047		62,201
Assets of discontinued operations	1,856		2,299
Liabilities
Deferred income taxes	5,522		5,988
Liabilities of discontinued operations	2,307		2,381
Discontinued Operation Or Asset Disposal Component [Member]
Operations
Total revenues	(13)	101
Earnings (loss) from discontinued operations before income taxes	(128)	(66)
Benefit (provision) for income taxes	121	34
Earnings (loss) from discontinued operations, net of taxes	(7)	(32)
Disposal
Gain (loss) on disposal before income taxes	(187)	(194)
Benefit for income taxes	85	29
Gain (loss) on disposal, net of taxes	(102)	(165)
Earnings (loss) from discontinued operations, net of taxes	(109)	(197)
Assets
Cash and cash equivalents	103		102
Property, plant and equipment - net	520		699
Other assets	1,233		1,498
Assets of discontinued operations	1,856		2,299
Liabilities
Deferred income taxes	374		374
Other liabilities	1,933		2,007
Liabilities of discontinued operations	$ 2,307		$ 2,381