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Operating Segments - Segment Financial Data (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Operating segments number | segment			3
Revenues:
Revenues	$ 8,792	$ 5,873	$ 25,269	$ 18,618
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	110	80	281	201
Segment Adjusted EBITDA	636	489	1,733	1,451
Maintenance capital	78	63	186	194
Transportation
Revenues:
Revenues	161	160	458	459
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	110	80	281	201
Segment Adjusted EBITDA	388	363	1,083	933
Maintenance capital	41	32	102	89
Facilities
Revenues:
Revenues	149	140	437	410
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment Adjusted EBITDA	173	182	530	550
Maintenance capital	33	28	74	94
Supply and Logistics
Revenues:
Revenues	8,482	5,573	24,374	17,749
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment Adjusted EBITDA	75	(56)	120	(32)
Maintenance capital	4	3	10	11
Operating Segments, Before Intersegment Adjustment | Transportation
Revenues:
Revenues	292	274	808	757
Operating Segments, Before Intersegment Adjustment | Facilities
Revenues:
Revenues	149	140	437	410
Operating Segments, Before Intersegment Adjustment | Supply and Logistics
Revenues:
Revenues	8,482	5,573	24,374	17,749
Intersegment
Revenues:
Revenues	(478)	(438)	(1,400)	(1,272)
Intersegment | Transportation
Revenues:
Revenues	(206)	(172)	(619)	(503)
Intersegment | Facilities
Revenues:
Revenues	(140)	(151)	(429)	(463)
Intersegment | Supply and Logistics
Revenues:
Revenues	(1)	(1)	(2)	(8)
Intersegment Adjustment
Revenues:
Revenues	(131)	(114)	(350)	(298)
Operating Segments
Revenues:
Revenues	9,270	6,311	26,669	19,890
Operating Segments | Transportation
Revenues:
Revenues	498	446	1,427	1,260
Operating Segments | Facilities
Revenues:
Revenues	289	291	866	873
Operating Segments | Supply and Logistics
Revenues:
Revenues	$ 8,483	$ 5,574	$ 24,376	$ 17,757

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