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Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]        
Loan facility carrying amount $ 8,476,024,000     $ 8,444,914,000
Bayview Lending Group [Member]        
Schedule of Equity Method Investments [Line Items]        
Minority interest in Bayview Lending Group LLC 20.00%      
Carrying value of minority interest investment in Bayview Lending Group LLC $ 0      
Bayview Lending Group [Member] | Other Revenues From Operations [Member]        
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments 37,000,000 $ 23,000,000    
Bayview Lending Group and Bayview Financial [Member]        
Schedule of Equity Method Investments [Line Items]        
Outstanding principal balances of mortgage servicing rights 2,500,000,000     2,500,000,000
Revenue from contract with customer 3,000,000 4,000,000    
Bayview Financial [Member]        
Schedule of Equity Method Investments [Line Items]        
Outstanding principal balances of residential mortgage loans from Bayview Financial 54,900,000,000     56,800,000,000
Revenues from sub-servicing 28,000,000 $ 30,000,000    
Investment securities in held-to-maturity portfolio securitized by Bayview Financial 108,000,000     $ 113,000,000
Addition on outstanding principal balances of residential mortgage loans from Bayview Financial     $ 7,900,000,000  
Bayview Financial [Member] | Syndicated Loan Facility [Member]        
Schedule of Equity Method Investments [Line Items]        
Loan facility carrying amount 738,000,000      
Bayview Financial [Member] | Syndicated Loan Facility [Member] | M&T Bank [Member]        
Schedule of Equity Method Investments [Line Items]        
Loan facility carrying amount $ 94,000,000