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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Contract with Customer, Liability, Revenue Recognized   $ (162)      
Increase (Decrease) in Accounts Receivable $ (1,667) 302      
Contract with Customer, Liability 353     $ 394 $ 380
Sunoco LP [Member]          
Contract with Customer, Asset, after Allowance for Credit Loss 128   $ 117    
Capitalized Contract Cost, Amortization 5 $ 4      
Receivables from Customers $ 140   $ 366