Asset Quality (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Exclusions from TDRs	$ 1,200,000,000	$ 2,300,000,000
Troubled debt restructurings (TDRs)	2,583,000,000	2,739,000,000
Specific ALLL reserve for TDRs	386,000,000	470,000,000	587,000,000
Nonperforming loans	2,510,000,000	3,088,000,000
Federal Reserve Bank [Member]
Loans pledged as collateral for contingent borrowings	19,200,000,000	23,400,000,000
Federal Home Loan Bank [Member]
Loans pledged as collateral for contingent borrowings	52,800,000,000	40,400,000,000
Equipment Lease Financing [Member] \| Excluded from impaired loans due to authoritative lease accounting guidance [Member]
Nonperforming loans	2,000,000	5,000,000
Nonperforming [Member]
Troubled debt restructurings (TDRs)	1,370,000,000	1,511,000,000
Accruing [Member]
Troubled debt restructurings (TDRs)	1,083,000,000	1,062,000,000
Performing TDRs, including credit card loans
Troubled debt restructurings (TDRs)	$ 1,200,000,000	$ 1,200,000,000

Represents associated allowance for the TDR portfolio, TDRs are individually evaluated for impairment.

No definition available.

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- Definition

Represents total of loans held for sale, loans accounted for under the fair value option, pooled purchased impaired loans, as well as certain consumer government insured or guaranteed loans which were evaluated for TDR consideration, not classified as TDRs. (Activity in period)

+ References

No definition available.

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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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- 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

The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)(1)(i)

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