Loans and Allowance for Credit Losses, PCI, by Loan to Value Ratio, Consumer (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2008
Purchased Credit Impaired Loans by Loan to Value [Abstract]
Purchased Credit Impaired Loans (carrying value)	$ 29,729	$ 30,968	$ 58,797
Residential Mortgage [Member]
Purchased Credit Impaired Loans by Loan to Value [Abstract]
Purchased Credit Impaired Loans (carrying value)	26,227	26,991
Real estate 1-4 family first mortgage [Member]
Purchased Credit Impaired Loans by Loan to Value [Abstract]
Purchased Credit Impaired Loans (carrying value)	26,086	26,839	39,214
Real estate 1-4 family junior lien mortgage [Member]
Purchased Credit Impaired Loans by Loan to Value [Abstract]
Purchased Credit Impaired Loans (carrying value)	141	152	728
Purchased Credit-Impaired Loans [Member] \| Residential Mortgage [Member]
Purchased Credit Impaired Loans by Loan to Value [Abstract]
0-60%	1,435	1,395
60.01-80%	4,514	4,149
80.01-100%	10,046	9,637
100.01-120%	7,707	8,177
Greater than 120%	8,270	10,027
No LTV/CLTV Available	47	22
Total consumer PCI loans (adjusted unpaid principal balance)	32,019	33,407
Purchased Credit Impaired Loans (carrying value)	26,227	26,991
Purchased Credit-Impaired Loans [Member] \| Real estate 1-4 family first mortgage [Member]
Purchased Credit Impaired Loans by Loan to Value [Abstract]
0-60%	1,414	1,374
60.01-80%	4,484	4,119
80.01-100%	9,987	9,576
100.01-120%	7,617	8,084
Greater than 120%	8,150	9,889
No LTV/CLTV Available	46	20
Total consumer PCI loans (adjusted unpaid principal balance)	31,698	33,062
Purchased Credit Impaired Loans (carrying value)	26,086	26,839
Purchased Credit-Impaired Loans [Member] \| Real estate 1-4 family junior lien mortgage [Member]
Purchased Credit Impaired Loans by Loan to Value [Abstract]
0-60%	21	21
60.01-80%	30	30
80.01-100%	59	61
100.01-120%	90	93
Greater than 120%	120	138
No LTV/CLTV Available	1	2
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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- Definition

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

No definition available.

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- Definition

Financing receivables with no loan to value ratio or combined loan to value ratio available.

+ References

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- Definition

Financing receivable with loan to value ratio eighty point zero one to one hundred Percent.

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Financing receivable with loan to value ratio greater than one hundred twenty percent.

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- Definition

Financing receivable with loan to value ratio one hundred point zero one to one hundred twenty percent.

+ References

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- Definition

Financing receivable with loan to value ratio sixty point zero one to eighty percent.

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- Definition

Financing receivable with loan to value ratio zero to 60 percent.

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