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Credit Quality - Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Parenthetical) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan and lease losses $ 1,115 $ 1,115 $ 1,103 $ 1,077 $ 1,138 $ 1,196
Portfolio loans and leases 109,091   95,086      
Residential Mortgage Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans measured at fair value on a recurring basis 192   179      
Leveraged leases            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan and lease losses 1   1      
Portfolio loans and leases $ 575   $ 624