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Asset Quality - PCI and Non-Impaired Loans Receivable (Details) - First Niagara Bank, N.A. [Member] - PCI [Member]
$ in Millions
Aug. 01, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Contractual required payments receivable $ 1,434
Nonaccretable difference 173
Expected cash flows 1,261
Accretable yield 172
Fair value $ 1,089