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Asset Quality - Post-Modification Outstanding Recorded Investment by Concession Type for Our Commercial Accruing and Nonaccruing TDRs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total commercial and consumer TDRs $ 57 $ 18
Commercial Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Extension of Maturity Date 41 0
Payment or Covenant Modification/Deferment 10 0
Total 51 0
Consumer Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Interest rate reduction 2 9
Other 4 9
Total $ 6 $ 18