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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Deferred Revenue $ 383 $ 383  
Contract with Customer, Asset, Net 66 66 $ 51
Contract with Customer, Liability, Revenue Recognized 12 75  
Contract with Customer, Asset, Reclassified to Receivable   15  
Increase (Decrease) in Accounts Receivable   137  
Contract with Customer, Liability 1 1 1
Receivables from Customers 582 582 $ 445
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Modification of Contract   0  
Sunoco LP [Member]      
Capitalized Contract Cost, Amortization $ 4 $ 10