Asset Quality (TDRs that were Modified in the Past Twelve Months which have Subsequently Defaulted) (Details)	12 Months Ended
Dec. 31, 2015 USD ($) contracts	Dec. 31, 2014 USD ($) contracts	Dec. 31, 2013 USD ($) contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	3,857	4,165	5,799
Recorded Investment - Subsequently defaulted TDRs \| $	$ 96,000,000	$ 179,000,000	$ 218,000,000
Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	37	81	105
Recorded Investment - Subsequently defaulted TDRs \| $	$ 23,000,000	$ 106,000,000	$ 106,000,000
Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	3,820	4,084	5,694
Recorded Investment - Subsequently defaulted TDRs \| $	$ 73,000,000	$ 73,000,000	$ 112,000,000
Commercial [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	23	38	67
Recorded Investment - Subsequently defaulted TDRs \| $	$ 9,000,000	$ 26,000,000	$ 47,000,000
Commercial Real Estate [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	13	43	38
Recorded Investment - Subsequently defaulted TDRs \| $	$ 13,000,000	$ 80,000,000	$ 59,000,000
Equipment Lease Financing [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	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 \| contracts	458	400	592
Recorded Investment - Subsequently defaulted TDRs \| $	$ 26,000,000	$ 21,000,000	$ 39,000,000
Residential Real Estate [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	150	155	255
Recorded Investment - Subsequently defaulted TDRs \| $	$ 22,000,000	$ 24,000,000	$ 35,000,000
Credit Card [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	3,045	3,397	4,598
Recorded Investment - Subsequently defaulted TDRs \| $	$ 24,000,000	$ 27,000,000	$ 34,000,000
Other Consumer Loans [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	167	132	249
Recorded Investment - Subsequently defaulted TDRs \| $	$ 1,000,000	$ 1,000,000	$ 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=49124121&loc=SL6953682-111524

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- Definition

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

+ References

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