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Segment Information - Reconciliation of Capital Expenditures (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |
Additions to property, plant and equipment | $ (455) | $ (280)
Operating Segments |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |
Additions to property, plant and equipment | (509) | (404)
Operating Segments | L&S |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |
Additions to property, plant and equipment | (190) | (97)
Operating Segments | G&P |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |
Additions to property, plant and equipment | (319) | (307)
Segment Reconciling Items |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |
Additions to property, plant and equipment | $ 54 | $ 124

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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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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