XML 78 R38.htm IDEA: XBRL DOCUMENT v3.20.2
Inventories (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Inventory Disclosure [Abstract]        
Finished goods   $ 100,000,000   $ 177,000,000
Raw materials   73,000,000   112,000,000
In-process inventories   15,000,000   18,000,000
Parts, supplies and other   64,000,000   66,000,000
Total inventories   252,000,000   373,000,000
Inventory [Line Items]        
Inventories, carrying amounts in excess of market value   58,000,000 $ 0  
Petroleum        
Inventory [Line Items]        
Inventories, carrying amounts in excess of market value $ 58,000,000 $ 0   $ 0