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Revenues - Contract Balances (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Change In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 90
Amounts recognized as revenue	(79)
Additions	445
Other	(3)
Ending balance	453
Crude Oil Sales Agreements Entered Into In Conjunction WIth Storage Arrangements And Future Inventory Exchanges
Change In Contract With Customer, Liability [Roll Forward]
Additions	197
Ending balance	197
Long-term capacity agreement | Cactus II Pipeline LLC
Change In Contract With Customer, Liability [Roll Forward]
Additions	$ 100

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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