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Fair Value Measurements - Changes in IRLC's (Details) - IRLCs - other assets - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of the period $ 5 $ 12
Issuances 15 70
Transfers (17) (78)
Fair value changes recognized in earnings (3) 1
Balance, end of period $ 0 $ 5