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Loans and Allowance for Loan Losses - Pre- and Post-Modification Outstanding Recorded Investment Amounts of Troubled Debt Restructurings (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Pre- and Post - modification recorded investments      
Financing Receivable, Troubled Debt Restructuring $ 476   $ 563
Pre-Modification Outstanding Recorded Investment [1] 4 $ 48  
Post-Modification Outstanding Recorded Investment [2] 4 48  
Commercial      
Pre- and Post - modification recorded investments      
Financing Receivable, Troubled Debt Restructuring 289   370
Pre-Modification Outstanding Recorded Investment [1] 3 43  
Post-Modification Outstanding Recorded Investment [2] 3 43  
Commercial | Commercial and industrial      
Pre- and Post - modification recorded investments      
Pre-Modification Outstanding Recorded Investment 3 41  
Post-Modification Outstanding Recorded Investment 3 41  
Commercial | Commercial mortgage      
Pre- and Post - modification recorded investments      
Pre-Modification Outstanding Recorded Investment   2  
Post-Modification Outstanding Recorded Investment   2  
Consumer      
Pre- and Post - modification recorded investments      
Financing Receivable, Troubled Debt Restructuring 187   193
Pre-Modification Outstanding Recorded Investment [1] 1 5  
Post-Modification Outstanding Recorded Investment [2] 1 5  
Consumer | residential mortgage and home equity [Member]      
Pre- and Post - modification recorded investments      
Pre-Modification Outstanding Recorded Investment 1 5  
Post-Modification Outstanding Recorded Investment 1 $ 5  
Other Consumer Loans [Member] | Consumer Loans Portfolio Segment [Member]      
Pre- and Post - modification recorded investments      
Financing Receivable, Troubled Debt Restructuring 1   1
Commercial mortgage | Commercial Loans Portfolio Segment [Member]      
Pre- and Post - modification recorded investments      
Financing Receivable, Troubled Debt Restructuring 168   168
Construction | Commercial Loans Portfolio Segment [Member]      
Pre- and Post - modification recorded investments      
Financing Receivable, Troubled Debt Restructuring $ 62   $ 62
[1] Represents the recorded investment in the loan immediately prior to the restructuring event.
[2] Represents the recorded investment in the loan immediately following the restructuring event. It includes the effect of paydowns that were required as part of the restructuring terms.