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Revenue Revenue Contract Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Contract with Customer, Liability $ 374 $ 339 $ 290 $ 365
Additions 249 170    
Revenue Recognized (165) $ (196)    
Sunoco LP [Member]        
Contract assets 134   121  
Accounts receivable from contracts with customers $ 324   $ 256