Loans and ACL - Summary of TDRs (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Summary of TDRs
Commercial and industrial	$ 46	$ 49
CRE-income producing properties	14	13
CRE-construction and development	8	16
Direct retail lending	69	72
Sales finance	16	17
Revolving credit	30	33
Residential mortgage-nonguaranteed	287	288
Residential mortgage-government guaranteed	393	316
Other lending subsidiaries	209	178
Total performing TDRs	1,072	982
Nonperforming TDRs (also included in NPL disclosures)	134	146
Total TDRs	1,206	1,128
ALLL attributable to TDRs	$ 132	$ 126

Allowance for loan losses allocated to troubled debt restructurings.

No definition available.

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- Definition

Reflects the net carrying amount of direct retail loans held in portfolio, after deducting deferred income, but before deducting the allowance for losses on direct retail loans.

+ References

No definition available.

+ Details

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- Definition

Financing Receivable Portfolio, Commercial [Abstract]

+ References

No definition available.

+ Details

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- Definition

Reflects the net carrying amount of commercial real estate loans that the underlying property is in the construction or development stage.

+ References

No definition available.

+ Details

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- Definition

Reflects the net carrying amount of Commercial real estate loans that the underlying collateral is income producing properties, consisting largely of office buildings, hotels, warehouses, apartments, rental houses and shopping centers.

+ References

No definition available.

+ Details

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- Definition

Amount of loans that have been restructured but do not accrue interest

+ References

No definition available.

+ Details

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- Definition

Reflects the net carrying amount of other lending subsidiaries loans held in portfolio, after deducting deferred income, but before deducting the allowance for losses on specialized lending loans.

+ References

No definition available.

+ Details

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- Definition

Recorded balance of nonguaranteed residential mortgage loans

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Reflects the net carrying amount of residential mortgage loans that have a government guarantee

+ References

No definition available.

+ Details

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- Definition

Reflects the net carrying amount of sales finance loans held in portfolio, after deducting deferred income, but before deducting the allowance for losses on sales finance loans.

+ References

No definition available.

+ Details

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- Definition

Amount of loans that continue to accrue interest under the terms of restructurings

+ References

No definition available.

+ Details

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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- Definition

Amount before allowance of credit card loans issued to individuals. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a)(4),(b))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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- Definition

Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a)(1))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5066-111524

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