Employee Share-based Incentives - Compensation Expense (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Share-Based Payment Arrangement [Abstract] | ||||
| Cost of prior grants of restricted stock units (“RSUs”), performance share units (“PSUs”) and stock appreciation rights (“SARs”) that are amortized over their applicable vesting periods | $ 422 | $ 348 | $ 1,321 | $ 1,152 |
| Accrual of estimated costs of share-based awards to be granted in future periods, predominantly those to full-career eligible employees | 684 | 562 | 2,125 | 1,770 |
| Total noncash compensation expense related to employee share-based incentive plans | $ 1,106 | $ 910 | $ 3,446 | $ 2,922 |