v3.20.2
Inventories Textual (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Inventories [Abstract]      
Lower of cost or market adjustment for crude oil and natural gas inventories $ 228    
LIFO Inventory Amount   $ 373 $ 286