Asset Quality (TDRs that were Modified in the Past Twelve Months which have Subsequently Defaulted) (Details) (USD $)	12 Months Ended
Dec. 31, 2014 contracts	Dec. 31, 2013 contracts	Dec. 31, 2012 contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	4,165	5,799	5,848
Recorded Investment - Subsequently defaulted TDRs	$ 179,000,000	$ 218,000,000	$ 293,000,000
Quantifying Misstatement In Current Year Financial Statements		6,200,000,000
Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	81	105	155
Recorded Investment - Subsequently defaulted TDRs	106,000,000	106,000,000	137,000,000
Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	4,084	5,694	5,693
Recorded Investment - Subsequently defaulted TDRs	73,000,000	112,000,000	156,000,000
Quantifying Misstatement In Current Year Financial Statements		(130,000,000)
Quantifying Misstatement in Current Year Financial Statements - Number of Contracts		(1,426)
Commercial [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	38	67	112
Recorded Investment - Subsequently defaulted TDRs	26,000,000	47,000,000	67,000,000
Commercial Real Estate [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	43	38	42
Recorded Investment - Subsequently defaulted TDRs	80,000,000	59,000,000	69,000,000
Equipment Lease Financing [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs			1
Recorded Investment - Subsequently defaulted TDRs			1,000,000
Home Equity [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	400	592	542
Recorded Investment - Subsequently defaulted TDRs	21,000,000	39,000,000	50,000,000
Residential Real Estate [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	155	255	482
Recorded Investment - Subsequently defaulted TDRs	24,000,000	35,000,000	70,000,000
Credit Card [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	3,397	4,598	4,551
Recorded Investment - Subsequently defaulted TDRs	27,000,000	34,000,000	32,000,000
Other Consumer [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	132	249	118
Recorded Investment - Subsequently defaulted TDRs	$ 1,000,000	$ 4,000,000	$ 4,000,000

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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- Definition

Amount of each individual error being corrected in the correcting adjustment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 1.N.Q3)

-URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 1

-Section N

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