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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]      
Accounts payable to related companies $ 27 $ 31  
Revenue 466 492 $ 431
Accounts Receivable, Related Parties, Current 79 159  
FGT [Member]      
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current 12 50  
Other Related Parties [Member]      
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current 37 31  
Phillips 66 Company [Member]      
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current 30 36  
Traverse Rover LLC [Member]      
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current $ 0 $ 42