Loans and Allowance for Credit Losses, Impaired Loans, Average Recorded Investment and Interest Income (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	$ 24,840	$ 27,245	$ 25,023	$ 27,522
Recognized interest income	349	352	697	701
Interest income:
Cash basis of accounting	111	100	219	199
Other	238	252	478	502
Total Commercial [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	3,676	4,798	3,687	4,953
Recognized interest income	65	61	132	118
Commercial and Industrial Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	1,109	1,193	1,050	1,221
Recognized interest income	23	17	43	38
Commercial Real Estate Mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	2,280	3,107	2,331	3,178
Recognized interest income	31	36	74	65
Commercial Real Estate Construction [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	264	465	284	521
Recognized interest income	11	8	15	15
Lease Financing [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	23	33	22	33
Recognized interest income	0	0	0	0
Total Consumer [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	21,164	22,447	21,336	22,569
Recognized interest income	284	291	565	583
Real estate 1-4 family first mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	18,161	19,313	18,321	19,407
Recognized interest income	235	238	466	475
Real estate 1-4 family junior lien mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	2,507	2,545	2,514	2,551
Recognized interest income	34	36	69	71
Credit Card [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	321	391	326	405
Recognized interest income	10	12	20	24
Automobile [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	118	160	121	169
Recognized interest income	4	4	8	11
Other revolving credit and installment [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	57	38	54	37
Recognized interest income	$ 1	$ 1	$ 2	$ 2

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=35738203&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=35738203&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.

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