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Variable Interest Entities and Securitizations - External Debt and Receivable Balances of Securitization Programs (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Variable Interest Entity, Primary Beneficiary    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Securities held by third-party investors, non-mortgage $ 17,087 $ 18,826
Receivables in the trust, non-mortgage 34,763 31,762
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 1,288 1,499
Receivables in the trust, mortgage 1,331 1,549
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 44 56
Receivables in the trust, mortgage 38 50
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 599 697
Receivables in the trust, mortgage 603 702
Cash balance of spread or reserve accounts, mortgage $ 121 $ 130