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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Contract with Customer, Liability, Revenue Recognized     $ (315) $ (143)    
Increase (Decrease) in Accounts Receivable     340 (253)    
Contract with Customer, Liability $ 377 $ 288 377 288 $ 392 $ 215
Sunoco LP [Member]            
Contract with Customer, Asset, Net 95   95   75  
Capitalized Contract Cost, Amortization 4 $ 3 8 $ 6    
Receivables from Customers $ 533   $ 533   $ 348