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Variable Interest Entities - Nonconsolidated Variable Interest Entities (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]      
Total assets $ 1,807,982 $ 1,785,009 $ 1,675,972
Total liabilities 1,683,580 $ 1,660,913 1,553,976
Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Assets in VIEs 248,127   206,500
Total assets 17,611   16,710
Total liabilities 2,448   2,754
Maximum exposure to loss: 28,443   27,501
Retained interests | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 7,240   5,848
Purchased interests | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 587   767
Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 5,093   5,034
Derivatives | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 9,161   8,974
Debt and equity | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 6,362   6,878
Mortgage-backed | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Assets in VIEs 161,154   128,378
Total assets 6,862   5,618
Maximum exposure to loss: 6,862   5,619
Mortgage-backed | Retained interests | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 6,740   5,355
Mortgage-backed | Purchased interests | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 121   263
Mortgage-backed | Derivatives | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 1   1
Tax credit and other investing | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Assets in VIEs 62,895   55,311
Total assets 6,505   6,978
Total liabilities 2,032   2,315
Maximum exposure to loss: 8,780   8,969
Tax credit and other investing | Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 4,241   4,138
Tax credit and other investing | Debt and equity | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 4,539   4,831
Corporate debt and other asset-backed | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Assets in VIEs 24,078   22,811
Total assets 4,244   4,114
Total liabilities 416   439
Maximum exposure to loss: 12,801   12,913
Corporate debt and other asset-backed | Retained interests | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 500   493
Corporate debt and other asset-backed | Purchased interests | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 466   504
Corporate debt and other asset-backed | Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 852   896
Corporate debt and other asset-backed | Derivatives | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: 9,160   8,973
Corporate debt and other asset-backed | Debt and equity | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Maximum exposure to loss: $ 1,823   $ 2,047