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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Contract with Customer, Liability, Revenue Recognized     $ (491) $ (211)    
Increase (Decrease) in Accounts Receivable     353 (155)    
Contract with Customer, Liability $ 349 $ 403 349 403 $ 392 $ 205
Sunoco LP [Member]            
Contract with Customer, Asset, after Allowance for Credit Loss 102   102   75  
Capitalized Contract Cost, Amortization 4 $ 4 12 $ 10    
Receivables from Customers $ 403   $ 403   $ 348