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Revenue Revenue Contract Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Contract with Customer, Liability $ 385 $ 385 $ 308 $ 377
Additions 434 413    
Revenue Recognized (357) $ (405)    
Sunoco LP [Member]        
Contract assets 135   121  
Accounts receivable from contracts with customers $ 422   $ 256