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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, 2022
Dec. 31, 2021
Actual    
Option adjusted spread (as a percent) 6.59% 7.12%
Constant prepayment rate (as a percent) 8.69% 9.24%
Weighted average cost to service per loan (in dollars per share) $ 79.25 $ 79.38
Fair value impact due to 10% adverse change    
Option adjusted spread $ 513 $ 383
Constant prepayment rate 506 373
Weighted average cost to service per loan 518 387
Fair value impact due to 20% adverse change    
Option adjusted spread 503 374
Constant prepayment rate 490 355
Weighted average cost to service per loan $ 512 $ 383