Operating Segments - Segment Financial Data (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Operating Segments
Operating segments number | segment									3
Revenues:
Revenues	$ 5,952	$ 5,170	$ 4,950	$ 4,111	$ 4,996	$ 5,551	$ 6,663	$ 5,942	$ 20,182	$ 23,152	$ 43,464
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities									195	183	108
Segment adjusted EBITDA									2,167	2,212	2,227
Capital expenditures									1,694	2,275	3,125
Maintenance capital									186	220	224
Total assets	26,103				24,142				26,103	24,142	23,923
Investments in unconsolidated entities	2,343				2,027				2,343	2,027	1,735
Transportation
Revenues:
Revenues									954	953	994
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities									195	183	108
Segment adjusted EBITDA									1,141	1,056	979
Capital expenditures									1,063	1,278	2,483
Maintenance capital									121	144	165
Total assets	11,863				11,272				11,863	11,272	10,441
Investments in unconsolidated entities	2,290				1,998				2,290	1,998	1,735
Facilities
Revenues:
Revenues									546	528	576
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment adjusted EBITDA									667	588	597
Capital expenditures									577	813	582
Maintenance capital									55	68	52
Total assets	7,878				7,645				7,878	7,645	7,137
Investments in unconsolidated entities	53				29				53	29
Supply and Logistics
Revenues:
Revenues									19,004	21,927	42,114
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment adjusted EBITDA									359	568	651
Capital expenditures									54	184	60
Maintenance capital									10	8	7
Total assets	$ 6,362				$ 5,225				6,362	5,225	6,345
Operating Segments
Revenues:
Revenues									21,709	24,589	44,932
Operating Segments | Transportation
Revenues:
Revenues									1,584	1,594	1,655
Operating Segments | Facilities
Revenues:
Revenues									1,107	1,050	1,127
Operating Segments | Supply and Logistics
Revenues:
Revenues									19,018	21,945	42,150
Intersegment
Revenues:
Revenues									1,527	1,437	1,468
Intersegment | Transportation
Revenues:
Revenues									630	641	661
Intersegment | Facilities
Revenues:
Revenues									561	522	551
Intersegment | Supply and Logistics
Revenues:
Revenues									14	18	36
Intersegment Adjustment
Revenues:
Revenues									$ 322	$ 256	$ 220