Reportable Segments Segment Assets (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets	$ 67,927	$ 65,173
Intrastate transportation and storage
Segment Reporting Information [Line Items]
Assets	5,072	4,882
Interstate transportation and storage
Segment Reporting Information [Line Items]
Assets	11,379	11,345
Midstream
Segment Reporting Information [Line Items]
Assets	17,740	17,111
Liquids transportation and services
Segment Reporting Information [Line Items]
Assets	10,159	7,235
Investment in Sunoco Logistics
Segment Reporting Information [Line Items]
Assets	17,255	15,423
Retail marketing
Segment Reporting Information [Line Items]
Assets	1,568	3,218
All other
Segment Reporting Information [Line Items]
Assets	$ 4,754	$ 5,959