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Mortgage Servicing Rights - MSRs and Related Characteristics by Portfolio (Detail)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
BasisPoint
Multiple
Dec. 31, 2021
USD ($)
BasisPoint
Multiple
Mar. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Servicing Assets at Fair Value [Line Items]            
Fair value $ 3,707 $ 2,953 $ 3,432 $ 2,713 $ 2,787 $ 2,210
Mortgage Servicing Rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing portfolio 222,716 218,953        
Fair value $ 3,707 $ 2,953        
Value (bps) | BasisPoint 166 135        
Weighted-average servicing fees (bps) | BasisPoint 32 32        
Multiple (value/servicing fees) 5.15 4.18        
Weighted-average note rate 3.54% 3.56%        
Weighted-average age (in years) 3 years 9 months 18 days 3 years 8 months 12 days        
Prepayment (constant prepayment rate) 6.90% 10.30%        
Weighted-average expected life (in years) 8 years 2 months 12 days 6 years 8 months 12 days        
Weighted-average option adjusted spread 6.20% 6.60%        
HFA [Member] | Mortgage Servicing Rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing portfolio $ 41,701 $ 40,652        
Fair value $ 697 $ 527        
Value (bps) | BasisPoint 167 130        
Weighted-average servicing fees (bps) | BasisPoint 36 36        
Multiple (value/servicing fees) | Multiple 4.65 3.63        
Weighted-average note rate 4.02% 4.07%        
Weighted-average age (in years) 3 years 10 months 24 days 3 years 9 months 18 days        
Prepayment (constant prepayment rate) 7.50% 11.50%        
Weighted-average expected life (in years) 8 years 7 months 6 days 6 years 6 months        
Weighted-average option adjusted spread 7.20% 7.30%        
Government Insured [Member] | Mortgage Servicing Rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing portfolio $ 21,358 $ 21,919        
Fair value $ 403 $ 308        
Value (bps) | BasisPoint 189 141        
Weighted-average servicing fees (bps) | BasisPoint 41 41        
Multiple (value/servicing fees) | Multiple 4.59 3.43        
Weighted-average note rate 3.67% 3.70%        
Weighted-average age (in years) 6 years 5 years 10 months 24 days        
Prepayment (constant prepayment rate) 8.50% 13.20%        
Weighted-average expected life (in years) 7 years 4 months 24 days 5 years 7 months 6 days        
Weighted-average option adjusted spread 6.90% 7.30%        
Conventional [Member] | Mortgage Servicing Rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing portfolio $ 159,657 $ 156,382        
Fair value $ 2,607 $ 2,118        
Value (bps) | BasisPoint 163 135        
Weighted-average servicing fees (bps) | BasisPoint 30 30        
Multiple (value/servicing fees) | Multiple 5.41 4.5        
Weighted-average note rate 3.40% 3.41%        
Weighted-average age (in years) 3 years 6 months 3 years 3 months 18 days        
Prepayment (constant prepayment rate) 6.50% 9.60%        
Weighted-average expected life (in years) 8 years 2 months 12 days 6 years 10 months 24 days        
Weighted-average option adjusted spread 5.90% 6.30%