Loans and Allowance for Credit Losses, Impaired Loans (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Impaired Loans [Abstract]
Unpaid principal balance	$ 24,413	$ 26,547
Impaired loans	20,562	22,377
Impaired loans with related allowance for credit losses	15,074	16,604
Related allowance for credit losses	2,171	2,593
Loans and Leases Receivable, Impaired, Commitment to Lend	747	403
Trial modifications [Member]
Impaired Loans [Abstract]
Impaired loans	215	299
Consumer Real Estate Loans Government Guaranteed Or Insured [Member]
Impaired Loans [Abstract]
Impaired loans	1,400	1,500
Total Commercial [Member]
Impaired Loans [Abstract]
Unpaid principal balance	6,286	7,148
Impaired loans	4,696	5,372
Impaired loans with related allowance for credit losses	4,380	5,026
Related allowance for credit losses	830	1,000
Commercial and Industrial Loans [Member]
Impaired Loans [Abstract]
Unpaid principal balance	4,401	5,058
Impaired loans	3,205	3,742
Impaired loans with related allowance for credit losses	2,901	3,418
Related allowance for credit losses	558	675
Commercial real estate mortgage [Member]
Impaired Loans [Abstract]
Unpaid principal balance	1,654	1,777
Impaired loans	1,337	1,418
Impaired loans with related allowance for credit losses	1,325	1,396
Related allowance for credit losses	238	280
Commercial Real Estate Construction [Member]
Impaired Loans [Abstract]
Unpaid principal balance	105	167
Impaired loans	62	93
Impaired loans with related allowance for credit losses	62	93
Related allowance for credit losses	11	22
Commercial Lease Financing Receivable [Member]
Impaired Loans [Abstract]
Unpaid principal balance	126	146
Impaired loans	92	119
Impaired loans with related allowance for credit losses	92	119
Related allowance for credit losses	23	23
Total Consumer [Member]
Impaired Loans [Abstract]
Unpaid principal balance	18,127	19,399
Impaired loans	15,866	17,005
Impaired loans with related allowance for credit losses	10,694	11,578
Related allowance for credit losses	1,341	1,593
Real estate 1-4 family first mortgage [Member]
Impaired Loans [Abstract]
Unpaid principal balance	15,256	16,438
Impaired loans	13,299	14,362
Impaired loans with related allowance for credit losses	8,677	9,475
Related allowance for credit losses	905	1,117
Real estate 1-4 family junior lien mortgage [Member]
Impaired Loans [Abstract]
Unpaid principal balance	2,273	2,399
Impaired loans	2,043	2,156
Impaired loans with related allowance for credit losses	1,557	1,681
Related allowance for credit losses	295	350
Credit Card [Member]
Impaired Loans [Abstract]
Unpaid principal balance	317	300
Impaired loans	316	300
Impaired loans with related allowance for credit losses	316	300
Related allowance for credit losses	113	104
Automobile [Member]
Impaired Loans [Abstract]
Unpaid principal balance	152	153
Impaired loans	85	85
Impaired loans with related allowance for credit losses	31	31
Related allowance for credit losses	4	5
Other revolving credit and installment [Member]
Impaired Loans [Abstract]
Unpaid principal balance	129	109
Impaired loans	123	102
Impaired loans with related allowance for credit losses	113	91
Related allowance for credit losses	$ 24	$ 17

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 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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- References

No definition available.

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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- Definition

Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

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