Amortized Mortgage Servicing Rights (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Changes in Amortized MSRs [Abstract]
Amortization	$ (63)	$ (56)	$ (127)	$ (113)
Valuation Allowance
Provision for mortgage servicing rights in excess of fair value	1	0	7	0
Amortized mortgage servicing rights, net	1,422		1,422		1,419
Amortized [Member]
Changes in Amortized MSRs [Abstract]
Balance, beginning of period	1,432	1,069	1,422	1,119
Adjustments from adoption of consolidation accounting guidance	0	0	0	(5)
Purchases	36	7	81	8
Servicing from securitizations or asset transfers	27	17	56	28
Amortization	(63)	(56)	(127)	(113)
Balance, end of period	1,432	1,037	1,432	1,037
Valuation Allowance
Beginning of period	(9)	0	(3)	0
Provision for mortgage servicing rights in excess of fair value	(1)	0	(7)	0
End of period	(10)	0	(10)	0
Amortized mortgage servicing rights, net	1,422	1,037	1,422	1,037
Fair value of amortized MSRs:
Beginning of period	1,898	1,283	1,812	1,261
End of period	$ 1,805	$ 1,307	$ 1,805	$ 1,307

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The increase during the reporting period in the cumulative value of servicing rights. This increase is the result of new servicing rights that are created when mortgages are sold or transferred.

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Amortized carrying amount (balance) 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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Fair value of the servicing asset that has been amortized as of the balance sheet date.

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Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

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New provisions recoveries or charged against this account which increase or reduce the net value of servicing assets.

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Adjustments from adoption of new consolidation accounting guidance.

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Changes In Amortized Mortgage Servicing Rights Abstract.

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Amortized carrying amount (balance) before valuation allowance 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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The value of new servicing assets acquired or created during the current period through purchases.

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