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Related Party Transactions Related Party Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]          
Contract with Customer, Liability, Revenue Recognized     $ (405) $ (315)  
Accounts payable to related companies $ 16   16   $ 31 [1]
Revenue from Related Parties 142 $ 136 275 $ 245  
Accounts Receivable, Related Parties, Current 140   140   159
FGT [Member]          
Related Party Transaction [Line Items]          
Accounts Receivable, Related Parties, Current 13   13   50
Phillips 66 Company [Member]          
Related Party Transaction [Line Items]          
Accounts Receivable, Related Parties, Current 9   9   36
Traverse [Member]          
Related Party Transaction [Line Items]          
Accounts Receivable, Related Parties, Current 62   62   42
Other Related Parties [Member]          
Related Party Transaction [Line Items]          
Accounts Receivable, Related Parties, Current $ 56   $ 56   $ 31
[1]
*As adjusted. See Note 1.