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Impairments (Tables)
 6 Months Ended
Jun. 30, 2020
Impairment Of Assets [Abstract]  
Summary of Commodity Price Assumptions Applied in Impairment Testing The near-term commodity price assumptions applied in impairment testing in the second quarter 2020 were as follows:

Commodity price assumptions [A]
2020
2021
2022
2023
Brent crude oil ($/b)
35
40
50
60
Henry Hub natural gas ($/MMBtu)
1.75
2.50
2.50
2.75
[A] Money of the day.