Acquisitions (Acquisition of Ozark Pipeline) (Details) bbl / d in Thousands, $ in Millions		10 Months Ended	12 Months Ended
	Mar. 01, 2017 USD ($) bbl / d in mi	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Payments to acquire property, plant, and equipment			$ 2,408	$ 2,111	$ 1,411
Ozark Pipeline
Business Acquisition [Line Items]
Payments to acquire property, plant, and equipment	$ 219
Pipeline length | mi	433
Pipeline diameter | in	22
Pipeline barrels handled | bbl / d	230
Revenues and other income		$ 64
Income from operations		$ 20