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Short-Term Borrowings (Schedule of Short-Term Borrowings) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Short Term Borrowings Summary      
Federal funds purchased $ 1,402us-gaap_FederalFundsPurchased $ 1,443us-gaap_FederalFundsPurchased  
Securities sold under agreements to repurchase 317us-gaap_SecuritiesSoldUnderAgreementsToRepurchase 463us-gaap_SecuritiesSoldUnderAgreementsToRepurchase  
Other short-term borrowed funds 1,998us-gaap_OtherShortTermBorrowings 2,232us-gaap_OtherShortTermBorrowings  
Total $ 3,717us-gaap_ShortTermBorrowings $ 4,138us-gaap_ShortTermBorrowings $ 2,864us-gaap_ShortTermBorrowings