Loans and Allowance for Credit Losses, PCI, by Delinquency Status, Consumer (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]
Purchased Credit Impaired Loans, Carrying Value	$ 35,534	$ 36,719
Residential Mortgage [Member]
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]
Purchased Credit Impaired Loans, Carrying Value	29,280	29,952
Residential Mortgage [Member] \| Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]
Current-29 DPD	25,726	25,961
30-59 DPD	2,833	3,292
60-89 DPD	1,309	1,442
90-119 DPD	624	799
120-179 DPD	1,039	1,179
180+ DPD	6,044	6,071
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 Consumer Days Past Due [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 Consumer Days Past Due [Abstract]
Current-29 DPD	25,458	25,693
30-59 DPD	2,818	3,272
60-89 DPD	1,301	1,433
90-119 DPD	619	791
120-179 DPD	1,029	1,169
180+ DPD	5,902	5,921
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 Consumer Days Past Due [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 Consumer Days Past Due [Abstract]
Current-29 DPD	268	268
30-59 DPD	15	20
60-89 DPD	8	9
90-119 DPD	5	8
120-179 DPD	10	10
180+ DPD	142	150
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

Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953401-111524

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- Definition

Financing receivables that are less than 90 days past due but more than 59 days past due.

+ References

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- Definition

Financing receivables that are current.

+ References

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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 that are less than 180 days past due but more than 119 days past due.

+ References

No definition available.

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- Definition

Financing receivables that are less than 120 days past due but more than 89 days past due.

+ References

No definition available.

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- Definition

Financing receivables that are equal to or greater than 180 days past due.

+ References

No definition available.

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