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Related Party Transactions Related Party Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Contract with Customer, Liability, Revenue Recognized			$ (315)	$ (143)
Accounts payable to related companies	$ 14		14		$ 59
Revenue from Related Parties	136	$ 120	245	$ 222
Accounts Receivable, Related Parties, Current	111		111		111
FGT [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	32		32		25
Phillips 66 Company [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	47		47		42
Other Related Parties [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	$ 32		$ 32		$ 44