Loans - Summary of Nonaccrual Loans (Detail) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Financing Receivable, Impaired [Line Items] | ||
| Nonaccrual loans | $ 3,387 | $ 3,652 |
| Total divided by gross loans at amortized cost | 1.60% | 1.90% |
| Nonaccrual loans allowance for loans losses divided by total | 63.40% | 127.80% |
| Past due | ||
| Financing Receivable, Impaired [Line Items] | ||
| Nonaccrual loans | $ 756 | $ 322 |
| Corporate | ||
| Financing Receivable, Impaired [Line Items] | ||
| Nonaccrual loans | 2,065 | 1,977 |
| Commercial real estate | ||
| Financing Receivable, Impaired [Line Items] | ||
| Nonaccrual loans | 1,079 | 800 |
| Residential real estate | ||
| Financing Receivable, Impaired [Line Items] | ||
| Nonaccrual loans | 85 | 104 |
| Securities-based | ||
| Financing Receivable, Impaired [Line Items] | ||
| Nonaccrual loans | 0 | 2 |
| Other collateralized | ||
| Financing Receivable, Impaired [Line Items] | ||
| Nonaccrual loans | 121 | 757 |
| Other | ||
| Financing Receivable, Impaired [Line Items] | ||
| Nonaccrual loans | $ 37 | $ 12 |