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Basis of Presentation and Accounting Policies - Measurement of Credit Losses (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses $ 1,730 $ 1,708 $ 900 $ 893 $ 890 $ 883
Total ALLL 1,772 1,751 910 904 902 897
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 1,181 1,113 751 746 747 743
Consumer Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses 549 595 149 147 143 140
Commercial and industrial | Commercial Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses 810 725 551 554 549 532
Commercial mortgage | Commercial Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses 279 292 143 134 139 142
Real estate — construction | Commercial Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses 34 41 22 23 24 33
Commercial lease financing | Commercial Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses 58 55 35 35 35 36
Real estate — residential mortgage | Consumer Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses 104 101 7 7 7 7
Home equity loans | Consumer Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses 183 197 31 33 36 35
Consumer direct loans | Consumer Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses 125 130 34 34 32 30
Consumer indirect loans | Consumer Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses 42 60 30 27 24 20
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 | Consumer Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses     328      
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 | Commercial mortgage | Commercial Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses     16      
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)      
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      
Impact of ASC 326 Adoption | Real estate — residential mortgage | Consumer Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses     77      
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 direct loans | Consumer Loans            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses     63      
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      
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 | 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 | 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      
Discontinued operations            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses $ 42 $ 43 10 $ 11 $ 12 $ 14
Discontinued operations | Impact of ASC 326 Adoption            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses     31      
Discontinued operations | As Reported Under ASC 326            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses     $ 41