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DERIVATIVES - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Derivatives      
Net derivative gain (loss) from commodity contracts   $ 79,000,000 $ (89,000,000)
Crude Oil Hedge Positions      
Derivatives      
Net derivative gain (loss) from commodity contracts $ 63,000,000    
Interest-rate Contract      
Derivatives      
Derivative, amount of hedged item $ 1,300,000,000 1,300,000,000  
Gain (loss) from interest-rate risk   $ 0 $ (3,000,000)
Interest-rate Contract | One month LIBOR      
Derivatives      
Interest rate to be in place to receive payment 2.75% 2.75%