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Purchased Credit Impaired Loans, Allowance for Credit Losses (Details) (USD $) In Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2010
Changes in allowance for PCI loan losses [Abstract]
Beginning Balance	$ 257	$ 298	$ 333	$ 0	$ 225
Provision for losses due to credit deterioration	83	93	771	853
Charge-offs	(67)	(118)	(806)	(520)
Ending Balance	273	273	298	333	225
Commercial and Industrial Loans [Member]
Changes in allowance for PCI loan losses [Abstract]
Beginning Balance	234	266	330	0
Provision for losses due to credit deterioration	44	55	712	850
Charge-offs	(63)	(106)	(776)	(520)
Ending Balance	215	215	266	330
Pick-a-pay [Member]
Changes in allowance for PCI loan losses [Abstract]
Beginning Balance	0	0	0	0
Provision for losses due to credit deterioration	0	0	0	0
Charge-offs	0	0	0	0
Ending Balance	0	0	0	0
Other Consumer [Member]
Changes in allowance for PCI loan losses [Abstract]
Beginning Balance	23	32	3	0
Provision for losses due to credit deterioration	39	38	59	3
Charge-offs	(4)	(12)	(30)	0
Ending Balance	$ 58	$ 58	$ 32	$ 3

Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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