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Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Variable Interest Entity [Line Items]          
Assets related to consolidated VIEs $ 540,455   $ 540,455   $ 495,426
Liabilities related to consolidated VIEs 487,260   487,260   442,943
Community Development And Tax Advantaged Investments [Member]          
Variable Interest Entity [Line Items]          
Federal and state income tax credits recognized in tax expense 142 $ 132 437 $ 423  
Expense related to investments 142 122 429 391  
Investment tax credits 118 80 307 326  
Expenses related to investments recognized in tax expense 97 80 297 237  
Financial Support Waived Fees [Member]          
Variable Interest Entity [Line Items]          
Financial or other support to money market funds 28 $ 8 49 $ 22  
Variable Interest Entity Not Primary Beneficiary [Member] | Private Investment Funds and Partnerships [Member]          
Variable Interest Entity [Line Items]          
Maximum exposure to loss 57   57   55
Assets related to consolidated VIEs 34   34   31
Variable Interest Entity Not Primary Beneficiary [Member] | Community Development And Tax Advantaged Investments [Member]          
Variable Interest Entity [Line Items]          
Maximum exposure to loss 12,085   12,085   12,118
Assets related to consolidated VIEs 6,552   6,552   6,148
Liabilities related to consolidated VIEs 3,201   3,201   2,938
Variable Interest Entity Not Primary Beneficiary [Member] | Minimum [Member]          
Variable Interest Entity [Line Items]          
Aggregate amount of investments in unconsolidated VIEs 1   1   1
Variable Interest Entity Not Primary Beneficiary [Member] | Maximum [Member]          
Variable Interest Entity [Line Items]          
Aggregate amount of investments in unconsolidated VIEs 80   80   87
Variable Interest Entity Primary Beneficiary [Member] | Community Development And Tax Advantaged Investments [Member]          
Variable Interest Entity [Line Items]          
Assets related to consolidated VIEs 3,900   3,900   4,000
Liabilities related to consolidated VIEs 3,200   3,200   3,200
Variable Interest Entity Primary Beneficiary [Member] | Tender Option Bond Program [Member]          
Variable Interest Entity [Line Items]          
Assets related to consolidated VIEs 2,800   2,800   3,000
Liabilities related to consolidated VIEs $ 1,500   $ 1,500   $ 2,700