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Segment Information - Reconciliation of Capital Expenditures (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Additions to property, plant and equipment | $ (372) | $ (302) | $ (652) | $ (606)
Operating Segments [Member] |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Additions to property, plant and equipment | (453) | (318) | (857) | (666)
Operating Segments [Member] | L&S [Member] |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Additions to property, plant and equipment | (136) | (106) | (233) | (181)
Operating Segments [Member] | G&P [Member] |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Additions to property, plant and equipment | (317) | (212) | (624) | (485)
Segment Reconciling Items [Member] |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Additions to property, plant and equipment | $ 81 | $ 16 | $ 205 | $ 60

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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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