Purchased Loans (Purchased Impaired Loans Balances) (Details) (Purchased Impaired Loans [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 6,778	$ 7,406
Outstanding Balance	7,394	8,319
Total commercial lending [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	968	1,249
Outstanding Balance	1,299	1,680
Total consumer lending [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,810	6,157
Outstanding Balance	6,095	6,639
Commercial [Member] \| Total commercial lending [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	231	308
Outstanding Balance	391	524
Commercial Real Estate [Member] \| Total commercial lending [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	737	941
Outstanding Balance	908	1,156
Residential Real Estate [Member] \| Total consumer lending [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,336	3,536
Outstanding Balance	3,341	3,651
Consumer [Member] \| Total consumer lending [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,474	2,621
Outstanding Balance	$ 2,754	$ 2,988

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.

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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.

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