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Related Party Transactions Related Party Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Contract with Customer, Liability, Revenue Recognized			$ (491)	$ (211)
Accounts payable to related companies	$ 32		32		$ 59
Revenue from Related Parties	129	$ 103	374	$ 325
Accounts Receivable, Related Parties, Current	166		166		111
FGT [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	51		51		25
Phillips 66 Company [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	36		36		42
Traverse [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	25		25		0
Other Related Parties [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	$ 54		$ 54		$ 44