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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Accounts payable to related companies $ 59 $ 31  
Revenue 431 303 $ 221
Accounts Receivable, Related Parties, Current 111 53  
FGT [Member]      
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current 25 11  
Other Related Parties [Member]      
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current 44 22  
Phillips 66 Company [Member]      
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current $ 42 $ 20