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Mortgage Servicing Rights - Summary of Adverse Changes to Weighted-Average Assumptions on the Fair Value of Servicing Rights (Details) - Mortgage servicing rights - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Actual    
Option adjusted spread (percent) 5.80% 5.90%
Constant prepayment rate (as a percent) 8.10% 7.90%
Weighted average cost to service per loan $ 68 $ 68
10% adverse change    
Option adjusted spread (percent) $ 1,014 $ 1,012
Constant prepayment rate (as a percent) 999 1,000
Weighted average cost to service per loan 1,025 1,023
20% adverse change    
Option adjusted spread (percent) 994 992
Constant prepayment rate (as a percent) 966 970
Weighted average cost to service per loan $ 1,015 $ 1,013