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Loans & Leases - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Unamortized premiums and discounts, deferred direct loan origination fees and costs, and fair value adjustments $ 152 $ 152   $ 296      
Unearned Income 466 466   479      
Loans pledged at the FHLB 16,600 16,600   13,100      
Loans pledged at the FRB 47,800 47,800   42,600      
Sales type lease - interest income 2 3          
Direct financing lease - interest income 26 48          
Allowance for loan and lease losses 1,115 1,115 $ 1,115 1,103 $ 1,077 $ 1,138 $ 1,196
Commercial leases              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan and lease losses $ 26 $ 26   $ 18