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Mortgage Servicing Rights - Sensitivity to Changes in Interest Rates of the Fair Value of MSR Portfolio and Related Derivative Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Down Scenario [Member] | Mortgage Servicing Rights [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]    
Net fair value 100 basis points $ (865) $ (334)
Net fair value 50 basis points (386) (153)
Net fair value 25 basis points (178) (73)
Down Scenario [Member] | Derivative [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]    
Net fair value 100 basis points 913 337
Net fair value 50 basis points 395 153
Net fair value 25 basis points 178 73
Down Scenario [Member] | Net Sensitivity [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]    
Net fair value 100 basis points 48 3
Net fair value 50 basis points 9  
Up Scenario [Member] | Mortgage Servicing Rights [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]    
Net fair value 100 basis points 266 224
Net fair value 50 basis points 149 125
Net fair value 25 basis points 78 66
Up Scenario [Member] | Derivative [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]    
Net fair value 100 basis points (277) (236)
Net fair value 50 basis points (152) (127)
Net fair value 25 basis points (79) (67)
Up Scenario [Member] | Net Sensitivity [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]    
Net fair value 100 basis points (11) (12)
Net fair value 50 basis points (3) (2)
Net fair value 25 basis points $ (1) $ (1)