Financial and Derivative Instruments - Additional Information (Details) - USD ($) $ in Millions |
9 Months Ended | |
---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
|
Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
Decrease in sales and other operating revenues due to cash flow hedging contracts | $ 2 | $ 0 |
Deferred losses in accumulated other comprehensive losses due to Outstanding crude oil price hedging contracts | $ 4 |