Loans and Allowance for Credit Losses, PCI, by FICO Score, Consumer (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2008
Purchased Credit Impaired Loans by FICO [Abstract]
Purchased Credit Impaired Loans (carrying value)	$ 29,729	$ 30,968	$ 58,797
Residential Mortgage [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Purchased Credit Impaired Loans (carrying value)	26,227	26,991
Residential Mortgage [Member] \| Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Less than 600	12,772	13,307
600-639	6,452	6,741
640-679	6,427	6,675
680-719	3,478	3,674
720-759	1,685	1,768
760-799	845	880
Greater than 800	193	203
No FICO available	167	159
Total consumer PCI loans (adjusted unpaid principal balance)	32,019	33,407
Purchased Credit Impaired Loans (carrying value)	26,227	26,991
Real estate 1-4 family first mortgage [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Purchased Credit Impaired Loans (carrying value)	26,086	26,839	39,214
Real estate 1-4 family first mortgage [Member] \| Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Less than 600	12,638	13,163
600-639	6,388	6,673
640-679	6,358	6,602
680-719	3,443	3,635
720-759	1,675	1,757
760-799	840	874
Greater than 800	192	202
No FICO available	164	156
Total consumer PCI loans (adjusted unpaid principal balance)	31,698	33,062
Purchased Credit Impaired Loans (carrying value)	26,086	26,839
Real estate 1-4 family junior lien mortgage [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Purchased Credit Impaired Loans (carrying value)	141	152	728
Real estate 1-4 family junior lien mortgage [Member] \| Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans by FICO [Abstract]
Less than 600	134	144
600-639	64	68
640-679	69	73
680-719	35	39
720-759	10	11
760-799	5	6
Greater than 800	1	1
No FICO available	3	3
Total consumer PCI loans (adjusted unpaid principal balance)	321	345
Purchased Credit Impaired Loans (carrying value)	$ 141	$ 152

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

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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

+ References

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+ References

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Financing receivables with FICO score less than 600.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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- Definition

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

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- Definition

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

+ References

No definition available.

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- Definition

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

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No definition available.

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