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Loans Held-for-Sale - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held-for-sale $ 1,830   $ 1,830   $ 5,054
Net gain on loan sales 32 $ 169 104 $ 564  
Loans Held-for-Sale          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net gain on loan sales     104 $ 564  
Residential first mortgage loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held-for-sale $ 8   $ 8   116
Commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held-for-sale         $ 18