Asset Quality (TDRs that were Modified in the Past Twelve Months which have Subsequently Defaulted) (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015 USD ($) contracts	Sep. 30, 2014 USD ($) contracts	Sep. 30, 2015 USD ($) contracts	Sep. 30, 2014 USD ($) contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	1,600	1,861	2,796	3,014
Recorded Investment - Subsequently defaulted TDRs	$ 29	$ 39	$ 69	$ 125
Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	10	14	32	68
Recorded Investment - Subsequently defaulted TDRs	$ 5	$ 15	$ 18	$ 68
Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	1,590	1,847	2,764	2,946
Recorded Investment - Subsequently defaulted TDRs	$ 24	$ 24	$ 51	$ 57
Commercial [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	7	1	20	34
Recorded Investment - Subsequently defaulted TDRs	$ 4	$ 1	$ 8	$ 23
Commercial Real Estate [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	3	13	11	34
Recorded Investment - Subsequently defaulted TDRs	$ 1	$ 14	$ 10	$ 45
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			$ 0
Home Equity [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	170	99	338	315
Recorded Investment - Subsequently defaulted TDRs	$ 8	$ 4	$ 17	$ 17
Residential Real Estate [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	33	52	104	128
Recorded Investment - Subsequently defaulted TDRs	$ 5	$ 6	$ 15	$ 20
Credit Card [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	1,337	1,665	2,197	2,393
Recorded Investment - Subsequently defaulted TDRs	$ 11	$ 14	$ 18	$ 19
Other Consumer [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs \| contracts	50	31	125	110
Recorded Investment - Subsequently defaulted TDRs			$ 1	$ 1

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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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+ References

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