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Loans Held for Sale - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans held for sale $ 351   $ 337
Revenue associated with the economic hedging program (less than) 367 $ (1,354)  
Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans held for sale 256   129
Valuation allowance 1   1
Consumer Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans held for sale 95   208
Valuation allowance 0   0
Commercial Loans - Fair Value Option [Member] | Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans held for sale 83   36
Commercial Loans - Transferred to Held for Sale [Member] | Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans held for sale 173   $ 93
Other Income (Loss) [Member] | Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Lower of amortized cost or fair value adjustment 0 0  
Residential mortgage banking revenue (expense) [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revenue associated with the economic hedging program (less than) $ 2 $ (3)