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Operating Segments - Segment Financial Data (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Operating Segments
Operating segments number | segment									3
Revenues:
Revenues	$ 9,154	$ 7,886	$ 8,253	$ 8,375	$ 8,786	$ 8,792	$ 8,080	$ 8,398	$ 33,669	$ 34,055	$ 26,223
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities									388	375	290
Segment Adjusted EBITDA									3,230	2,681	2,081
Capital expenditures									1,387	1,888	2,458
Maintenance capital									287	252	247
Total assets	28,677				25,511				28,677	25,511	25,351
Investments in unconsolidated entities	3,683				2,702				3,683	2,702	2,756
Transportation
Revenues:
Revenues									788	648	612
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities									388	375	290
Segment Adjusted EBITDA									1,722	1,508	1,287
Capital expenditures									1,127	1,631	2,126
Maintenance capital									161	139	120
Total assets	14,902				13,288				14,902	13,288	12,661
Investments in unconsolidated entities	3,557				2,594				3,557	2,594	2,681
Facilities
Revenues:
Revenues									609	588	555
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment Adjusted EBITDA									705	711	734
Capital expenditures									227	234	312
Maintenance capital									97	100	114
Total assets	7,336				7,200				7,336	7,200	7,313
Investments in unconsolidated entities	126				108				126	108	75
Supply And Logistics
Revenues:
Revenues									32,272	32,819	25,056
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment Adjusted EBITDA									803	462	60
Capital expenditures									33	23	20
Maintenance capital									29	13	13
Total assets	$ 6,439				$ 5,023				6,439	5,023	5,377
Operating Segments Excluding Intersegment Elimination | Transportation
Revenues:
Revenues									1,259	1,116	1,021
Operating Segments Excluding Intersegment Elimination | Facilities
Revenues:
Revenues									609	588	555
Operating Segments Excluding Intersegment Elimination | Supply And Logistics
Revenues:
Revenues									32,272	32,819	25,056
Intersegment
Revenues:
Revenues									(2,098)	(1,918)	(1,733)
Intersegment | Transportation
Revenues:
Revenues									(1,061)	(874)	(697)
Intersegment | Facilities
Revenues:
Revenues									(562)	(573)	(618)
Intersegment | Supply And Logistics
Revenues:
Revenues									(4)	(3)	(9)
Intersegment Adjustment
Revenues:
Revenues									(471)	(468)	(409)
Operating Segments
Revenues:
Revenues									35,767	35,973	27,956
Operating Segments | Transportation
Revenues:
Revenues									2,320	1,990	1,718
Operating Segments | Facilities
Revenues:
Revenues									1,171	1,161	1,173
Operating Segments | Supply And Logistics
Revenues:
Revenues									$ 32,276	$ 32,822	$ 25,065

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