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Inventories - Additional Information (Detail)
barrelOfOil in Millions, $ in Millions
3 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
vlcc
barrelOfOil
Aug. 31, 2020
barrelOfOil
Jun. 30, 2020
USD ($)
vlcc
Dec. 31, 2019
USD ($)
Inventory Disclosure [Abstract]        
Charges related to inventories     $ 53  
Charges related to inventories, after income taxes     $ 52  
Inventory [Line Items]        
Number of very large crude carriers | vlcc 3   3  
Crude oil in very large crude carriers | barrelOfOil 3.7      
Cost of crude oil $ 204   $ 204 $ 92
Very Large Crude Carriers (VLCCs)        
Inventory [Line Items]        
Cost of crude oil $ 113   $ 113  
Forecast | Subsequent Event        
Inventory [Line Items]        
Crude oil in very large crude carriers | barrelOfOil   6.0