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Revenue Revenue Contract Liabilities (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Contract with Customer, Liability $ 407 $ 361 $ 308 $ 377
Additions 611 598    
Revenue Recognized (512) $ (614)    
Sunoco LP [Member]        
Contract assets 148   121  
Accounts receivable from contracts with customers $ 473   $ 256