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Inventories - Additional Information (Detail)
bbl in Millions, $ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
vlcc
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
vlcc
bbl
Inventory [Line Items]        
Cost of crude oil     $ 76 $ 226
Charges related to inventories   $ 53    
Charges related to inventories, after income taxes   $ 52    
Very Large Crude Carriers (VLCCs)        
Inventory [Line Items]        
Cost of crude oil       $ 164
Crude oil loaded in very large crude carriers (in barrels of oil) | bbl       4.2
Number of very large crude carriers | vlcc       2
Number of VLCCs cargos sold | vlcc 2