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Revenue Contracts with customers (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Jan. 01, 2018
Contract with Customer, Liability $ 290 $ 365   $ 394
Deferred Revenue, Additions 771 651    
Contract with Customer, Liability, Revenue Recognized $ (846) (680)    
Sunoco LP [Member]        
Receivables from Customers   366 $ 256  
Contract with Customer, Asset, after Allowance for Credit Loss   $ 117 $ 121