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Capitalized Servicing Assets - Economic Assumptions Used to Determine Fair Value of Capitalized Servicing Rights and Sensitivity of Value to Changes in Assumptions (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Weighted-average discount rate 14.43% 18.00%
Residential Mortgage Loans [Member]    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Weighted-average prepayment speeds 6.93%  
Impact on fair value of 10% adverse change $ (16)  
Impact on fair value of 20% adverse change $ (31)  
Weighted-average OAS 7.90%  
Impact on fair value of 10% adverse change $ (18)  
Impact on fair value of 20% adverse change $ (35)  
Weighted-average discount rate 11.45% 12.29%
Commercial Mortgage Loans [Member]    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Weighted-average discount rate 14.43%  
Impact on fair value of 10% adverse change $ (6)  
Impact on fair value of 20% adverse change $ (12)