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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

X

- 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

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- Definition

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+ References

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