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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]        
Additions to property, plant and equipment per the consolidated statements of cash flows     $ 3,823 $ 2,315
Asset retirement expenditures     1 7
Increase (decrease) in capital accruals     (300) 67
Capital expenditures [1] $ 1,386 $ 841 $ 3,524 $ 2,389
[1]
Capital expenditures include changes in capital accruals. See Note 19 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2019 and 2018 as reported in the consolidated statements of cash flows.