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Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Minimum [Member]
         
Variable Interest Entity [Line Items]          
Aggregate amount of investments in unconsolidated VIEs $ 1,000,000   $ 1,000,000   $ 1,000,000
Maximum [Member]
         
Variable Interest Entity [Line Items]          
Aggregate amount of investments in unconsolidated VIEs 43,000,000   43,000,000   37,000,000
Conduit [Member]
         
Variable Interest Entity [Line Items]          
Assets related to consolidated VIEs 114,000,000   114,000,000   116,000,000
Tender Option Bond Program [Member]
         
Variable Interest Entity [Line Items]          
Assets related to consolidated VIEs 4,500,000,000   4,500,000,000   4,600,000,000
Liabilities related to consolidated VIEs 4,300,000,000   4,300,000,000   4,600,000,000
Community Development and Tax Advantaged Investments [Member]
         
Variable Interest Entity [Line Items]          
Federal and state income tax credits recognized in tax expense 179,000,000 173,000,000 357,000,000 340,000,000  
Expense related to investments 166,000,000 227,000,000 330,000,000 439,000,000  
Expenses related to investments recognized in tax expense 59,000,000 100,000,000 130,000,000 180,000,000  
Investment tax credits 217,000,000 131,000,000 320,000,000 200,000,000  
Assets related to consolidated VIEs 2,500,000,000   2,500,000,000   2,500,000,000
Liabilities related to consolidated VIEs 1,900,000,000   1,900,000,000   1,800,000,000
Investment carrying amount 4,291,000,000   4,291,000,000   4,178,000,000
Maximum exposure to loss 7,663,000,000   7,663,000,000   7,390,000,000
Private Investment Funds And Partnerships [Member]
         
Variable Interest Entity [Line Items]          
Investment carrying amount 99,000,000   99,000,000   98,000,000
Maximum exposure to loss $ 106,000,000   $ 106,000,000   $ 107,000,000