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Loans Held-for-Sale (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held-for-sale $ 3,482   $ 3,482   $ 5,054
Net gain on loan sales 27 $ 168 72 $ 395  
Loans Held-for-Sale          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net gain on loan sales     72 $ 395  
Residential first mortgage loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held-for-sale $ 301   $ 301   116
Commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held-for-sale         $ 18