Loans and Allowance for Credit Losses, PCI, by FICO Score, Consumer (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Purchased Credit Impaired Loans by FICO [Abstract]
Purchased Credit Impaired Loans, Carrying Value	$ 35,534	$ 36,719
Residential Mortgage [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Purchased Credit Impaired Loans, Carrying Value	29,280	29,952
Residential Mortgage [Member] \| Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Less than 600	16,365	17,379
600-639	7,467	7,572
640-679	6,826	6,735
680-719	3,680	3,745
720-759	1,867	1,889
760-799	903	909
Greater than 800	206	217
No FICO available	261	298
Purchased Credit Impaired Loans	37,575	38,744
Purchased Credit Impaired Loans, Carrying Value	29,280	29,952
Real estate 1-4 family first mortgage [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Purchased Credit Impaired Loans, Carrying Value	29,082	29,746
Real estate 1-4 family first mortgage [Member] \| Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Less than 600	16,173	17,169
600-639	7,385	7,489
640-679	6,736	6,646
680-719	3,635	3,698
720-759	1,853	1,875
760-799	897	903
Greater than 800	204	215
No FICO available	244	284
Purchased Credit Impaired Loans	37,127	38,279
Purchased Credit Impaired Loans, Carrying Value	29,082	29,746
Real estate 1-4 family junior lien mortgage [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Purchased Credit Impaired Loans, Carrying Value	198	206
Real estate 1-4 family junior lien mortgage [Member] \| Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Less than 600	192	210
600-639	82	83
640-679	90	89
680-719	45	47
720-759	14	14
760-799	6	6
Greater than 800	2	2
No FICO available	17	14
Purchased Credit Impaired Loans	448	465
Purchased Credit Impaired Loans, Carrying Value	$ 198	$ 206

The balance of financing receivables that were acquired with deteriorated credit quality.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524

-Subparagraph (h)

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- Definition

The balance of financing receivables that were acquired with deteriorated credit quality before deduction of accretable yield and nonaccretable difference.

+ References

No definition available.

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- Definition

Financing receivables with FICO score greater than 800.

+ References

No definition available.

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- Definition

Financing receivables with FICO score less than 600.

+ References

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- Definition

Financing Receivable, Recorded Investment, FICO Score Not Available.

+ References

No definition available.

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- Definition

Financing receivables with FICO score less than 800 but more than 759.

+ References

No definition available.

+ Details

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- Definition

Financing receivables with FICO score less than 760 but more than 719.

+ References

No definition available.

+ Details

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- Definition

Financing receivables with FICO score less than 720 but more than 679.

+ References

No definition available.

+ Details

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- Definition

Financing receivables with FICO score less than 680 but more than 639.

+ References

No definition available.

+ Details

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- Definition

Financing receivables with FICO score less than 640 but more than 600.

+ References

No definition available.

+ Details

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