Asset Quality (Narrative) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Troubled debt restructurings (TDRs)	$ 2,351,000,000	$ 2,583,000,000
Nonperforming loans	2,126,000,000	2,510,000,000
TDRs [Member]
Associated Allowance for TDRs	319,000,000	386,000,000	$ 470,000,000
Nonperforming [Member]
Troubled debt restructurings (TDRs)	1,119,000,000	1,370,000,000
Performing, including Consumer Credit Card TDRs [Member]
Troubled debt restructurings (TDRs)	1,232,000,000	1,213,000,000
Excluded from impaired loans due to authoritative lease accounting guidance [Member] \| Equipment Lease Financing [Member]
Nonperforming loans	7,000,000	2,000,000
Federal Reserve Bank [Member]
Loans pledged as collateral for contingent borrowings	20,200,000,000	19,200,000,000
Federal Home Loan Bank [Member]
Loans pledged as collateral for contingent borrowings	$ 56,400,000,000	$ 52,800,000,000

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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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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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=49124121&loc=d3e5111-111524

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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)
-URI http://asc.fasb.org/extlink&oid=55761124&loc=SL6224234-111729

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