(Gain) Loss from Divestitures, Asset Impairments and Unusual Items, Net (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2026 |
|
| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | West Tier [Member] | ||
| Asset Impairments and Unusual Items | ||
| Gain on business divestiture | $ 34 | |
| Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain Loss From Divestitures Asset Impairments And Unusual Items | |
| Oil recovery and sludge processing services [Member] | ||
| Asset Impairments and Unusual Items | ||
| Asset impairments | $ 16 | $ 16 |