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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
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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.

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- Definition Capital Expenditures Excluding Acquisitions + References No definition available. + Details
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- Definition Increase (decrease) during the period in the accrual for capital expenditures + References No definition available. + Details
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- Definition Payments to acquire businesses excluding inventories including contingent consideration and liabilities assumed. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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