Premises, Equipment, Lease Commitments and Other Assets Textuals (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009
Premises, Equipment, Lease Commitments and Other Assets Textual [Abstract]
Depreciation and amortization expense for premises and equipment	$ 1,400,000,000	$ 1,500,000,000	$ 1,300,000,000
Net gains (losses) on disposition or premises and equipment	(17,000,000)	(115,000,000)	(22,000,000)
Operating leases for premises and equipment, Term (In years)	15
Operating leases for premises and equipment, Longest term (In years)	94
Operating lease rental expense, net of rental income	$ 1,200,000,000	$ 1,300,000,000	$ 1,400,000,000

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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- Definition

The gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

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