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Deposits and Borrowings - Deposits and Short-term Borrowings (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Deposits:      
Non-interest bearing deposits $ 25,055 $ 25,081  
Interest-bearing deposits 187,848 180,467  
Total deposits 212,903 205,548 $ 204,264
Short-term Debt [Line Items]      
Short-term borrowings 1,021 17,080  
Federal funds purchased and securities loaned or sold under agreements to repurchase      
Short-term Debt [Line Items]      
Short-term borrowings 1,021 880  
FHLB advances      
Short-term Debt [Line Items]      
Short-term borrowings $ 0 $ 16,200