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Inventories (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Inventories [abstract]      
Crude oil $ 2,014 $ 2,022  
Petroleum products 315 443  
Natural gas 642 229  
Other 424 390  
Inventories 3,395 3,084 $ 3,363
Inventory write-down $ 77 $ 58