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Asset Quality - PCI and Non-Impaired Loans Receivable (Details) - USD ($)
$ in Millions
Aug. 01, 2016
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accretable yield   $ 5
First Niagara Bank, N.A. [Member] | Purchase Credit Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractual required payments receivable $ 1,378  
Nonaccretable difference 189  
Expected cash flows 1,189  
Accretable yield 205  
Fair value $ 984