Mortgage Banking Activities , Mortgage Servicing Rights Carried at Fair Value (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in MSRs measured at fair value
Fair value, beginning of year	$ 14,467
Changes in fair value:
Due to changes in valuation model inputs or assumptions	(3,680)	(2,957)	(1,534)
Other changes in fair value	(2,141)	(2,554)	(3,436)
Total changes in fair value of MSRs measured at fair value	(5,821)	(5,511)	(4,970)
Fair value, end of year	12,603	14,467
Carried at Fair Value [Member]
Changes in MSRs measured at fair value
Fair value, beginning of year	14,467	16,004	14,714
Adjustments from adoption of consolidation accounting guidance	0	(118)	0
Acquired from Wachovia	0	0	34
Servicing from securitizations or asset transfers	3,957	4,092	6,226
Net additions	3,957	3,974	6,260
Changes in fair value:
Due to changes in valuation model inputs or assumptions	(3,680)	(2,957)	(1,534)
Other changes in fair value	(2,141)	(2,554)	(3,436)
Total changes in fair value of MSRs measured at fair value	(5,821)	(5,511)	(4,970)
Fair value, end of year	$ 12,603	$ 14,467	$ 16,004

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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The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

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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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The net Increase or Decrease in fair value as a result of changes in the inputs, assumptions, or model used to calculate the fair value of servicing assets.

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Net Additions To Mortgage Servicing Rights.

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