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Related Party Transactions Related Party Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Contract with Customer, Liability, Revenue Recognized		$ (162)
Accounts payable to related companies	$ 9		$ 31
Revenue from Related Parties	133	$ 109
Accounts Receivable, Related Parties, Current	132		159
FGT [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	20		50
Phillips 66 Company [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	11		36
Traverse [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	54		42
Other Related Parties [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	$ 47		$ 31