Fair Value Measurements (Reconciliation of Net Beginning and Ending Balances Recorded for Net Assets and Liabilities Classified as Level 3) (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|||
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||||
| Beginning balance | $ 300 | $ 62 | $ 277 | $ 58 | ||
| Unrealized and realized (gain)/loss included in net income(a) | [1] | (7) | (4) | 17 | 3 | |
| Settlements of derivative instruments | (4) | (3) | (5) | (6) | ||
| Ending balance | $ 289 | $ 55 | $ 289 | $ 55 | ||
| Term of contract | 5 years | |||||
| ||||||