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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 ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Actual    
Option adjusted spread (percent) 5.30% 5.40%
Constant prepayment rate (as a percent) 7.70% 7.90%
Weighted average cost to service per loan $ 68,000,000 $ 69,000,000
10% adverse change    
Option adjusted spread (percent) 1,072,000,000 1,091,000,000
Constant prepayment rate (as a percent) 1,054,000,000 1,073,000,000
Weighted average cost to service per loan 1,081,000,000 1,100,000,000
20% adverse change    
Option adjusted spread (percent) 1,053,000,000 1,072,000,000
Constant prepayment rate (as a percent) 1,020,000,000 1,040,000,000
Weighted average cost to service per loan $ 1,071,000,000 $ 1,090,000,000