Loans and Allowance for Credit Losses, Impaired Loans, Average Recorded Investment and Interest Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	$ 27,852	$ 27,598	$ 23,268
Recognized interest income	1,283	1,079	698
Interest Income On Impaired Loans [Abstract]
Interest income, cash basis of accounting	316	180	250
Interest income, other	967	899	448
Commercial and Industrial Loans [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	2,281	3,282	4,098
Recognized interest income	111	105	64
Commercial Real Estate Mortgage [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	4,821	5,308	4,598
Recognized interest income	119	80	41
Commercial Real Estate Construction [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	1,818	2,481	3,203
Recognized interest income	61	70	28
Lease Financing [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	57	80	166
Recognized interest income	1	0	0
Foreign Loans [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	36	29	47
Recognized interest income	1	0	0
Total Commercial [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	9,013	11,180	12,112
Recognized interest income	293	255	133
Real estate 1-4 family first mortgage [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	15,750	13,592	9,221
Recognized interest income	803	700	494
Real estate 1-4 family junior lien mortgage [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	2,193	1,962	1,443
Recognized interest income	80	76	55
Credit Card [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	572	594	360
Recognized interest income	63	21	13
Other revolving credit and installment [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	324	270	132
Recognized interest income	44	27	3
Total Consumer [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	18,839	16,418	11,156
Recognized interest income	$ 990	$ 824	$ 565

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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- Definition

The total interest income recognized during the time within that period that the financing receivables were impaired.

+ References

No definition available.

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