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Basis of Presentation and Accounting Policies - Measurement of Credit Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses $ 1,708 $ 1,359 $ 1,104 $ 900 $ 890 $ 883 $ 883
Total ALLL 1,751 1,402 1,145 910 902 896 897
Accrued expense and other liabilities       75      
Total allowance for credit losses       985      
Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses 1,113 818 627 751 747 737 743
Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses 595 541 477   143 146 140
Commercial and industrial | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses 725 542 410 551 549 530 532
Real estate — construction | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses 41 25 15   24 28 33
Commercial lease financing | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses 55 44 43   35 35 36
Home equity loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses 197 184 178 31 36 36 35
Consumer direct loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses 130 116 97   32 33 30
Consumer indirect loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses 60 48 36 30 24 22 20
As Reported Under ASC 326              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     1,104        
Total ALLL     1,145        
Accrued expense and other liabilities     145        
Total allowance for credit losses     1,290        
As Reported Under ASC 326 | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     627        
As Reported Under ASC 326 | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     477        
As Reported Under ASC 326 | Commercial and industrial | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     410        
As Reported Under ASC 326 | Real estate — commercial mortgage | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     159        
As Reported Under ASC 326 | Real estate — construction | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     15        
As Reported Under ASC 326 | Commercial lease financing | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     43        
As Reported Under ASC 326 | Real estate — residential mortgage | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     84        
As Reported Under ASC 326 | Home equity loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     178        
As Reported Under ASC 326 | Consumer direct loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     97        
As Reported Under ASC 326 | Credit cards | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     82        
As Reported Under ASC 326 | Consumer indirect loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     36        
Impact of ASC 326 Adoption              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       204      
Total ALLL       235      
Accrued expense and other liabilities     70        
Total allowance for credit losses     305        
Impact of ASC 326 Adoption | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       (124)      
Impact of ASC 326 Adoption | Commercial and industrial | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       (141)      
Impact of ASC 326 Adoption | Home equity loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       147      
Impact of ASC 326 Adoption | Consumer indirect loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       6      
Discontinued operations              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses $ 43 $ 43 41 10 $ 12 $ 13 $ 14
Discontinued operations | As Reported Under ASC 326              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     $ 41        
Discontinued operations | Impact of ASC 326 Adoption              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       31      
Continuing operations | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       149      
Continuing operations | Real estate — construction | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       22      
Continuing operations | Commercial lease financing | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       35      
Continuing operations | Consumer direct loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       34      
Continuing operations | Impact of ASC 326 Adoption | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       328      
Continuing operations | Impact of ASC 326 Adoption | Real estate — construction | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       (7)      
Continuing operations | Impact of ASC 326 Adoption | Commercial lease financing | Commercial Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       8      
Continuing operations | Impact of ASC 326 Adoption | Consumer direct loans | Consumer Loans              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses       $ 63