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Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Apr. 28, 2017
Dec. 31, 2016
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 $ 364      
Bayview Lending Group and Bayview Financial [Member]        
Schedule of Equity Method Investments [Line Items]        
Outstanding principal balances of mortgage servicing rights 3,400     $ 3,500
Revenues from servicing 4 $ 5    
Bayview Financial [Member]        
Schedule of Equity Method Investments [Line Items]        
Outstanding principal balances of residential mortgage loans from Bayview Financial 40,800     30,400
Revenues from sub-servicing 23 $ 23    
Investment securities in held-to-maturity portfolio securitized by Bayview Financial $ 153     $ 158
Bayview Financial [Member] | Subsequent Event [Member]        
Schedule of Equity Method Investments [Line Items]        
Loan to Bayview Financial     $ 100