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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
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   46,000,000
Financial Support Waived Fees [Member]          
Variable Interest Entity [Line Items]          
Financial or other support to money market funds 9,000,000 $ 28,000,000 26,000,000 $ 58,000,000  
Community Development and Tax Advantaged Investments [Member]          
Variable Interest Entity [Line Items]          
Federal and state income tax credits recognized in tax expense 164,000,000 170,000,000 332,000,000 338,000,000  
Expense related to investments 156,000,000 156,000,000 307,000,000 302,000,000  
Investment tax credits 408,000,000 170,000,000 631,000,000 284,000,000  
Expenses related to investments recognized in tax expense 66,000,000 $ 65,000,000 133,000,000 $ 131,000,000  
Investment carrying amount 5,114,000,000   5,114,000,000   5,257,000,000
Maximum exposure to loss 9,687,000,000   9,687,000,000   9,436,000,000
Assets related to consolidated VIEs 3,200,000,000   3,200,000,000   3,000,000,000
Liabilities related to consolidated VIEs 2,300,000,000   2,300,000,000   2,200,000,000
Private Investment Funds and Partnerships [Member]          
Variable Interest Entity [Line Items]          
Investment carrying amount 28,000,000   28,000,000   32,000,000
Maximum exposure to loss 49,000,000   49,000,000   47,000,000
Conduit [Member]          
Variable Interest Entity [Line Items]          
Assets related to consolidated VIEs 27,000,000   27,000,000   28,000,000
Tender Option Bond Program [Member]          
Variable Interest Entity [Line Items]          
Assets related to consolidated VIEs 1,400,000,000   1,400,000,000   2,300,000,000
Liabilities related to consolidated VIEs $ 1,400,000,000   $ 1,400,000,000   $ 2,200,000,000