v3.26.1
Variable Interest Entities - Nonconsolidated Variable Interest Entities (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Variable Interest Entity [Line Items]    
Total assets $ 2,060,180 $ 1,809,320
Total liabilities 1,937,398 1,684,348
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Assets in VIEs 279,910 271,331
Total assets 18,933 17,746
Total liabilities 3,032 3,016
Maximum exposure to loss: 30,207 29,107
Retained interests | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 6,932 6,458
Purchased interests | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 746 681
Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 6,113 6,239
Derivatives | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 9,355 9,445
Debt and equity | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 7,061 6,284
Mortgage-backed | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Assets in VIEs 184,467 180,240
Total assets 6,597 6,094
Maximum exposure to loss: 6,597 6,095
Mortgage-backed | Retained interests | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 6,459 5,947
Mortgage-backed | Purchased interests | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 137 147
Mortgage-backed | Derivatives | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 1 1
Tax credit, credit-related, real estate and other investing | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Assets in VIEs 71,440 67,290
Total assets 7,198 7,073
Total liabilities 2,667 2,587
Maximum exposure to loss: 9,951 9,870
Tax credit, credit-related, real estate and other investing | Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 5,252 5,376
Tax credit, credit-related, real estate and other investing | Debt and equity | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 4,699 4,494
Corporate debt and other asset-backed | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Assets in VIEs 24,003 23,801
Total assets 5,138 4,579
Total liabilities 365 429
Maximum exposure to loss: 13,659 13,142
Corporate debt and other asset-backed | Retained interests | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 473 511
Corporate debt and other asset-backed | Purchased interests | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 609 534
Corporate debt and other asset-backed | Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 861 863
Corporate debt and other asset-backed | Derivatives | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: 9,354 9,444
Corporate debt and other asset-backed | Debt and equity | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum exposure to loss: $ 2,362 $ 1,790