Property, Plant and Equipment - Components of Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Land	$ 11	$ 11
Building and improvements	40	39
Pipeline and equipment	1,228	1,162
Other	33	18
Property, plant and equipment, gross	1,312	1,230
Accumulated depreciation, and amortization	(613)	(567)
Property plant and equipment excluding construction in progress	699	663
Construction in progress	27	79
Property, plant and equipment, net	726	742
Operating lease cost	0
Accumulated depreciation related to assets under operating leases	133	121
Accumulated depreciation related to assets under capital lease	6	5
Building and Improvements | Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life			10 years
Building and Improvements | Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life			40 years
Pipeline and Equipment
Property Plant And Equipment [Line Items]
Operating lease cost	369	366
Finance lease cost	$ 23	$ 23
Pipeline and Equipment | Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life			10 years
Pipeline and Equipment | Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life			30 years
Other | Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life			5 years
Other | Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, depreciable life			25 years