Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Costs Incurred for Oil and Gas Producing Activities (Parenthetical) (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Upstream Contracts comprised in right-of-use assets [member] | |||
| Disclosure of information about consolidated entities [line items] | |||
| Development cost related to Upstream contracts comprised in right-of-use assets | $ 194 | $ 206 | $ 313 |