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Operating Segments - Segment Financial Data (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Operating segments number | segment			3
Revenues:
Revenues	$ 8,080	$ 6,078	$ 16,478	$ 12,745
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	96	68	171	121
Segment adjusted EBITDA	505	450	1,097	962
Maintenance capital	63	71	108	131
Transportation
Revenues:
Revenues	152	161	298	299
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	96	68	171	121
Segment adjusted EBITDA	360	298	695	571
Maintenance capital	32	27	61	57
Facilities
Revenues:
Revenues	147	136	288	270
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment adjusted EBITDA	171	180	357	368
Maintenance capital	26	39	41	66
Supply and Logistics
Revenues:
Revenues	7,781	5,781	15,892	12,176
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment adjusted EBITDA	(26)	(28)	45	23
Maintenance capital	5	5	6	8
Operating Segments, Before Intersegment Adjustment | Transportation
Revenues:
Revenues	264	258	517	483
Operating Segments, Before Intersegment Adjustment | Facilities
Revenues:
Revenues	147	136	288	270
Operating Segments, Before Intersegment Adjustment | Supply and Logistics
Revenues:
Revenues	7,781	5,781	15,892	12,176
Intersegment
Revenues:
Revenues	(460)	(419)	(920)	(835)
Intersegment | Transportation
Revenues:
Revenues	(211)	(167)	(412)	(331)
Intersegment | Facilities
Revenues:
Revenues	(137)	(153)	(288)	(312)
Intersegment | Supply and Logistics
Revenues:
Revenues		(2)	(1)	(8)
Intersegment Adjustment
Revenues:
Revenues	(112)	(97)	(219)	(184)
Operating Segments
Revenues:
Revenues	8,540	6,497	17,398	13,580
Operating Segments | Transportation
Revenues:
Revenues	475	425	929	814
Operating Segments | Facilities
Revenues:
Revenues	284	289	576	582
Operating Segments | Supply and Logistics
Revenues:
Revenues	$ 7,781	$ 5,783	$ 15,893	$ 12,184

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