Purchased Loans (Purchase Loan Balances) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Purchased Impaired Loans - Outstanding Balance	$ 5,007,000,000	$ 6,485,000,000
Purchased Impaired Loans - Recorded Investment	4,858,000,000	6,106,000,000	7,406,000,000
Purchased Impaired Loans - Carrying Value	3,986,000,000	5,102,000,000
Total commercial lending [Member]
Financing Receivable, Impaired [Line Items]
Purchased Impaired Loans - Outstanding Balance	466,000,000	937,000,000
Purchased Impaired Loans - Recorded Investment	310,000,000	673,000,000	1,249,000,000
Purchased Impaired Loans - Carrying Value	231,000,000	540,000,000
Total commercial lending [Member] \| Commercial [Member]
Financing Receivable, Impaired [Line Items]
Purchased Impaired Loans - Outstanding Balance	159,000,000	282,000,000
Purchased Impaired Loans - Recorded Investment	74,000,000	157,000,000
Purchased Impaired Loans - Carrying Value	57,000,000	131,000,000
Total commercial lending [Member] \| Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Purchased Impaired Loans - Outstanding Balance	307,000,000	655,000,000
Purchased Impaired Loans - Recorded Investment	236,000,000	516,000,000
Purchased Impaired Loans - Carrying Value	174,000,000	409,000,000
Total consumer lending [Member]
Financing Receivable, Impaired [Line Items]
Purchased Impaired Loans - Outstanding Balance	4,541,000,000	5,548,000,000
Purchased Impaired Loans - Recorded Investment	4,548,000,000	5,433,000,000	6,157,000,000
Purchased Impaired Loans - Carrying Value	3,755,000,000	4,562,000,000
Total consumer lending [Member] \| Consumer [Member]
Financing Receivable, Impaired [Line Items]
Purchased Impaired Loans - Outstanding Balance	2,145,000,000	2,523,000,000
Purchased Impaired Loans - Recorded Investment	1,989,000,000	2,312,000,000
Purchased Impaired Loans - Carrying Value	1,661,000,000	1,971,000,000
Total consumer lending [Member] \| Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Purchased Impaired Loans - Outstanding Balance	2,396,000,000	3,025,000,000
Purchased Impaired Loans - Recorded Investment	2,559,000,000	3,121,000,000
Purchased Impaired Loans - Carrying Value	$ 2,094,000,000	$ 2,591,000,000

The carrying value as of the reporting period of loans not accounted for as debt securiites with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments.

No definition available.

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- Definition

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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- Definition

The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

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