Loans and Commitments to Extend Credit (Narrative) (Details) (USD $) In Billions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Federal Reserve Bank [Member]
Loans pledged as collateral for contingent borrowings	$ 24.3	$ 23.4
Federal Home Loan Bank [Member]
Loans pledged as collateral for contingent borrowings	$ 49.0	$ 40.4

The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)(1)(i)

-URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729

Name:	us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedAsCollateral
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant