The discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer. This is used as a key input and assumption in measuring the fair value of assets or liabilities that relate to a transferor's continuing involvement, if any, as of the date of the latest statement of financial position presented.

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Estimated speed of prepayments of principal on financial assets. This is used as a key input and assumption in measuring the fair value of assets or liabilities that relate to a transferor's continuing involvement, if any, as of the date of the latest statement of financial position presented.

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- Definition

The weighted average life of securitized assets. This is used as a key input and assumption in measuring the fair value of assets or liabilities that relate to a transferor's continuing involvement, if any, as of the date of the latest statement of financial position presented.

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- Definition

The hypothetical financial impact of a 10 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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- Definition

The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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- Definition

The hypothetical financial impact of a 20 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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- Definition

The hypothetical financial impact of a 20 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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- Definition

Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Loan Servicing (Residential Mortgage Servicing Rights Sensitivity) (Details) (USD $) In Millions, unless otherwise specified					9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2012 Residential Mortgage Servicing Rights [Member] Yr	Sep. 30, 2012 Fixed-Rate Residential Mortgage [Member]	Sep. 30, 2012 Adjustable Rate Residential Mortgage [Member]
Fair value of mortgage servicing rights	$ 563	$ 563	$ 573	$ 830	$ 563
Composition of residential mortgage loans serviced for others					100.00%	99.00%	1.00%
Weighted average life, in years					3.9
Prepayment speed					19.60%
Effect on fair value of a 10% increase, prepayment speed					(35)
Effect on fair value of a 20% increase, prepayment speed					(66)
Weighted average discount rate					10.60%
Effect on fair value of a 10% increase, discount rate					(19)
Effect on fair value of a 20% increase, discount rate					$ (37)