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Loans Held for Sale - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale $ 282   $ 282   $ 289
Revenue associated with the economic hedging program (less than) 276 $ 189 (22) $ 1,738  
Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale 193   193   212
Valuation allowance 17   17   0
Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale 89   89   77
Valuation allowance 0   0   2
Commercial Loans - Fair Value Option [Member] | Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale 41   41   178
Commercial Loans - Transferred to Held for Sale [Member] | Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale 152   152   34
Residential Mortgage [Member] | Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale 89   89   $ 77
Other Income (Loss) [Member] | Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Lower of amortized cost or fair value adjustment (16) 0 (25) 0  
Residential mortgage banking revenue (expense) [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Revenue associated with the economic hedging program (less than) $ 0 $ 1 $ (1) $ (1)