Asset Quality (Nonperforming Assets) (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Nonperforming loans	$ 2,252,000,000	$ 2,510,000,000
OREO and Foreclosed Assets	326,000,000	370,000,000
Total nonperforming assets	$ 2,578,000,000	$ 2,880,000,000
Nonperforming loans to total loans	1.10%	1.23%
Nonperforming assets to total loans, OREO and foreclosed assets	1.25%	1.40%
Nonperforming assets to total assets	0.73%	0.83%
Total commercial lending [Member]
Nonperforming loans	$ 503,000,000	$ 626,000,000
Total consumer lending [Member]
Nonperforming loans	1,749,000,000	1,884,000,000
Commercial [Member] \| Total commercial lending [Member]
Nonperforming loans	258,000,000	290,000,000
Commercial Real Estate [Member] \| Total commercial lending [Member]
Nonperforming loans	242,000,000	334,000,000
Equipment Lease Financing [Member] \| Total commercial lending [Member]
Nonperforming loans	3,000,000	2,000,000
Home Equity [Member] \| Total consumer lending [Member]
Nonperforming loans	1,057,000,000	1,112,000,000
Residential Real Estate [Member] \| Foreclosure in process [Member]
Nonperforming loans	600,000,000	800,000,000
Residential Real Estate [Member] \| Foreclosure in process [Member] \| Government Insured Or Guaranteed [Member]
Nonperforming loans	400,000,000	500,000,000
Residential Real Estate [Member] \| Total consumer lending [Member]
Nonperforming loans	633,000,000	706,000,000
Credit Card [Member] \| Total consumer lending [Member]
Nonperforming loans	3,000,000	3,000,000
Other Consumer [Member] \| Total consumer lending [Member]
Nonperforming loans	56,000,000	63,000,000
OREO [Member]
OREO and Foreclosed Assets	302,000,000	351,000,000
Foreclosed and Other Assets [Member]
OREO and Foreclosed Assets	$ 24,000,000	$ 19,000,000

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No definition available.

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- Definition

Reflects the percentage derived from dividing total nonperforming assets by total loans, OREO and foreclosed assets.

+ References

No definition available.

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- Definition

Represents total nonperforming loans and OREO and foreclosed assets.

+ References

No definition available.

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524

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- Definition

Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans.

+ References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ 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 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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