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Variable Interest Entities and Securitizations - External Debt and Receivable Balances of Securitization Programs (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Variable Interest Entity, Primary Beneficiary    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Securities held by third-party investors, non-mortgage $ 18,826 $ 16,166
Receivables in the trust, non-mortgage 31,762 33,783
Cash balance of spread or reserve accounts, non-mortgage 0 0
Variable Interest Entity, Not Primary Beneficiary | Option- ARM    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Securities held by third-party investors, mortgage 1,499 1,754
Receivables in the trust, mortgage 1,549 1,814
Cash balance of spread or reserve accounts, mortgage 8 8
Variable Interest Entity, Not Primary Beneficiary | GreenPoint HELOCs    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Securities held by third-party investors, mortgage 56 74
Receivables in the trust, mortgage 50 68
Variable Interest Entity, Not Primary Beneficiary | GreenPoint Manufactured Housing    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Securities held by third-party investors, mortgage 697 789
Receivables in the trust, mortgage 702 794
Cash balance of spread or reserve accounts, mortgage $ 130 $ 134