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Mortgage Loans Held for Sale - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Mortgage Loans Held for Sale [Abstract]    
Sale of mortgage loans held for sale $ 13,877 $ 34,464
Gain (Loss) on Sale of Mortgage Loans (33) 267
Mortgage loans held for sale in foreclosure $ 30 $ 65