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Variable Interest Entities and Securitizations - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Variable Interest Entity [Line Items]      
Funded HELOCs advances $ 30   $ 30
Unfunded commitment on residual interests on trusts 6   6
Maximum exposure to loss 4,681   4,451
Amortization Method Qualified Affordable Housing Project Investments, Amortization 257 $ 231  
Affordable Housing Tax Credits And Other Tax Benefits, Amount 387 $ 268  
Amortization Method Qualified Affordable Housing Project Investments 3,400   3,200
Qualified Affordable Housing Project Investments, Commitment 1,300    
Carrying amounts of assets, unconsolidated 4,019   3,796
VIEs consolidated assets $ 34,537   37,157
Minimum [Member]      
Variable Interest Entity [Line Items]      
Affordable Housing Tax Credits Commitment, Year to be Paid 2015    
Maximum [Member]      
Variable Interest Entity [Line Items]      
Affordable Housing Tax Credits Commitment, Year to be Paid 2018    
Affordable housing entities      
Variable Interest Entity [Line Items]      
Maximum exposure to loss $ 3,744   3,500
Carrying amounts of assets, unconsolidated 3,744   3,500
Total assets of the unconsolidated VIE investment funds 10,800   10,200
VIEs consolidated assets 0   0
Entities that provide capital to low-income and rural communities      
Variable Interest Entity [Line Items]      
Maximum exposure to loss 0   1
Carrying amounts of assets, unconsolidated 0   1
VIEs consolidated assets 370   374
Other      
Variable Interest Entity [Line Items]      
Maximum exposure to loss 61   74
Carrying amounts of assets, unconsolidated 61   74
VIEs consolidated assets 0   4
Other VIE assets held in trust 130   159
Variable Interest Entity, Not Primary Beneficiary | Option- ARM      
Variable Interest Entity [Line Items]      
Securities held by third-party investors, mortgage 1,813   2,026
Unpaid principal balance of securitization trusts 1,874   2,094
Variable Interest Entity, Not Primary Beneficiary | GreenPoint HELOCs      
Variable Interest Entity [Line Items]      
Securities held by third-party investors, mortgage 79   95
Unpaid principal balance of securitization trusts 74   89
Variable Interest Entity, Not Primary Beneficiary | GreenPoint Manufactured Housing      
Variable Interest Entity [Line Items]      
Securities held by third-party investors, mortgage 812   887
Unpaid principal balance of securitization trusts 817   $ 893
Maximum exposure to loss $ 420