Goodwill and Other Intangible Assets (Fees from Mortgage and Other Loan Servicing) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Servicing Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Fees from Mortgage and Other Loan Servicing	$ 129	$ 121

The total amount of contractually specified servicing fees, late fees, and ancillary fees earned for each period for which results of operations are presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122596-111746

Name:	us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration