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Mortgage Servicing Rights - MSRs and Related Characteristics by Portfolio (Detail)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
BasisPoint
Multiple
Dec. 31, 2018
USD ($)
Multiple
BasisPoint
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Servicing Assets at Fair Value [Line Items]            
Fair value $ 2,458 $ 2,791 $ 2,656 $ 2,844 $ 2,780 $ 2,645
Mortgage Servicing Rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing portfolio 226,969 229,284        
Fair value $ 2,458 $ 2,791        
Value (bps) | BasisPoint 108 122        
Weighted-average servicing fees (bps) | BasisPoint 30 30        
Multiple (value/servicing fees) | Multiple 3.59 4.11        
Weighted-average note rate 4.18% 4.15%        
Weighted-average age (in years) 4 years 6 months 4 years 3 months 18 days        
Weighted-average expected prepayment (constant prepayment rate) 12.50% 9.50%        
Weighted-average expected life (in years) 6 years 7 years 2 months 12 days        
Weighted-average option adjusted spread 7.50% 7.60%        
HFA [Member] | Mortgage Servicing Rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing portfolio $ 45,117 $ 44,384        
Fair value $ 475 $ 526        
Value (bps) | BasisPoint 105 119        
Weighted-average servicing fees (bps) | BasisPoint 34 34        
Multiple (value/servicing fees) | Multiple 3.07 3.45        
Weighted-average note rate 4.65% 4.59%        
Weighted-average age (in years) 3 years 6 months 3 years 3 months 18 days        
Weighted-average expected prepayment (constant prepayment rate) 12.10% 9.80%        
Weighted-average expected life (in years) 6 years 7 months 6 days 7 years 8 months 12 days        
Weighted-average option adjusted spread 8.50% 8.60%        
Government Insured [Member] | Mortgage Servicing Rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing portfolio $ 36,012 $ 35,990        
Fair value $ 438 $ 465        
Value (bps) | BasisPoint 122 129        
Weighted-average servicing fees (bps) | BasisPoint 37 36        
Multiple (value/servicing fees) | Multiple 3.27 3.63        
Weighted-average note rate 4.00% 3.97%        
Weighted-average age (in years) 4 years 9 months 18 days 4 years 8 months 12 days        
Weighted-average expected prepayment (constant prepayment rate) 13.40% 11.00%        
Weighted-average expected life (in years) 5 years 9 months 18 days 6 years 8 months 12 days        
Weighted-average option adjusted spread 8.10% 8.30%        
Conventional [Member] | Mortgage Servicing Rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing portfolio $ 145,840 $ 148,910        
Fair value $ 1,545 $ 1,800        
Value (bps) | BasisPoint 106 121        
Weighted-average servicing fees (bps) | BasisPoint 27 27        
Multiple (value/servicing fees) | Multiple 3.91 4.52        
Weighted-average note rate 4.08% 4.06%        
Weighted-average age (in years) 4 years 9 months 18 days 4 years 6 months        
Weighted-average expected prepayment (constant prepayment rate) 12.40% 9.10%        
Weighted-average expected life (in years) 5 years 10 months 24 days 7 years 1 month 6 days        
Weighted-average option adjusted spread 7.10% 7.20%