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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
Mar. 31, 2017
Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]    
Additions to property, plant and equipment per consolidated statements of cash flows $ 610 $ 745
Asset retirement expenditures 1 0
Decrease in capital accruals (72) (137)
Total capital expenditures before acquisitions 539 608
Acquisitions [1] 220 (133)
Capital expenditures [2] $ 759 $ 475
[1] The three months ended March 31, 2017 reflects the acquisition of the Ozark pipeline. The three months ended March 31, 2016 reflects adjustments to the fair values of the property, plant and equipment, intangibles and goodwill acquired in connection with the MarkWest Merger.
[2] Capital expenditures include changes in capital accruals. See Note 17 for a reconciliation of total capital expenditures to additions to property, plant and equipment as reported in the consolidated statements of cash flows.