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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Deferred Revenue $ 271 $ 271  
Contract with Customer, Asset, Net 59 59 $ 51
Contract with Customer, Liability, Revenue Recognized 28 63  
Contract with Customer, Asset, Reclassified to Receivable   8  
Increase (Decrease) in Accounts Receivable   42  
Contract with Customer, Liability 1 1 1
Receivables from Customers 487 487 $ 445
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Modification of Contract   0  
Sunoco LP [Member]      
Capitalized Contract Cost, Amortization $ 3 $ 6