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Variable Interest Entities and Securitizations - External Debt and Receivable Balances of Securitization Programs (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Variable Interest Entity, Primary Beneficiary    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Securities held by third-party investors, non-mortgage $ 15,656 $ 11,624
Receivables in the trust, non-mortgage 33,581 36,545
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 1,813 2,026
Receivables in the trust, mortgage 1,874 2,094
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 79 95
Receivables in the trust, mortgage 74 89
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 812 887
Receivables in the trust, mortgage 817 893
Cash balance of spread or reserve accounts, mortgage $ 137 $ 143