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Supplemental Cash Flow Information (Reconciliation of Additions to Property, Plant and Equipment to Total Capital Expenditures) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Supplemental Cash Flow Elements [Abstract]        
Additions to property, plant and equipment per the consolidated statements of cash flows     $ 1,358 $ 1,072
Decrease in capital accruals     (5) (46)
Capital expenditures [1] $ 709 $ 515 $ 1,353 $ 1,026
[1] Includes changes in capital expenditure accruals. See Note 18 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2025 and 2024 as reported in the consolidated statements of cash flows.