Loans and Allowance for Credit Losses, Impaired Loans, Average Recorded Investment and Interest Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	$ 29,868	$ 27,350	$ 29,671	$ 27,598
Recognized interest income	392	320	774	629
Interest Income On Impaired Loans [Abstract]
Interest income, cash basis of accounting	119	77	242	126
Interest income, other	273	243	532	503
Total Commercial [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	6,920	9,768	7,096	10,073
Recognized interest income	69	83	139	149
Commercial and Industrial Loans [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	1,573	2,665	1,603	2,756
Recognized interest income	22	33	48	72
Commercial Real Estate Mortgage [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	4,194	5,016	4,250	5,095
Recognized interest income	36	33	68	50
Commercial Real Estate Construction [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	1,082	1,986	1,174	2,124
Recognized interest income	11	17	23	27
Lease Financing [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	30	58	32	60
Recognized interest income	0	0	0	0
Foreign Loans [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	41	43	37	38
Recognized interest income	0	0	0	0
Total Consumer [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	22,948	17,582	22,575	17,525
Recognized interest income	323	237	635	480
Real estate 1-4 family first mortgage [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	19,669	14,641	19,275	14,563
Recognized interest income	264	190	515	379
Real estate 1-4 family junior lien mortgage [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	2,499	2,079	2,490	2,065
Recognized interest income	38	22	73	44
Credit Card [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	490	582	503	587
Recognized interest income	14	17	29	31
Automobile [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	262	256	280	285
Recognized interest income	7	8	17	26
Other revolving credit and installment [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	28	24	27	25
Recognized interest income	$ 0	$ 0	$ 1	$ 0

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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- Definition

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

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