Asset Quality (TDRs that were Modified in the Past Twelve Months which have Subsequently Defaulted) (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015 USD ($) contracts	Jun. 30, 2014 USD ($) contracts	Jun. 30, 2015 USD ($) contracts	Jun. 30, 2014 USD ($) contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	1,350	1,668	1,818	2,319
Recorded Investment - Subsequently defaulted TDRs \| $	$ 27	$ 66	$ 45	$ 96
Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	10	37	22	54
Recorded Investment - Subsequently defaulted TDRs \| $	$ 4	$ 37	$ 13	$ 53
Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	1,340	1,631	1,796	2,265
Recorded Investment - Subsequently defaulted TDRs \| $	$ 23	$ 29	$ 32	$ 43
Commercial [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	8	23	13	33
Recorded Investment - Subsequently defaulted TDRs \| $	$ 3	$ 16	$ 4	$ 22
Commercial Real Estate [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	1	14	8	21
Recorded Investment - Subsequently defaulted TDRs \| $	$ 1	$ 21	$ 9	$ 31
Equipment Lease Financing [Member] \| Total commercial lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	1		1
Home Equity [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	102	100	168	216
Recorded Investment - Subsequently defaulted TDRs \| $	$ 5	$ 6	$ 9	$ 13
Residential Real Estate [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	60	51	71	76
Recorded Investment - Subsequently defaulted TDRs \| $	$ 8	$ 11	$ 10	$ 14
Credit Card [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	1,140	1,446	1,482	1,894
Recorded Investment - Subsequently defaulted TDRs \| $	$ 10	$ 12	$ 12	$ 15
Other Consumer [Member] \| Total consumer lending [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts - Subsequently defaulted TDRs	38	34	75	79
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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