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Impairment Expense
 12 Months Ended
Dec. 31, 2024
Impairment Expense [Abstract]  
Impairment Expense Impairment Expense
Impairment expense was as follows for the years ended December 31, 2024, 2023 and 2022 (in millions):

 202420232022
Proved properties (1)
$295 $44 $120 
Unproved properties (2)
63 125 206 
Other assets31 31 29 
Inventories— — 25 
Firm commitment contracts2 2 2 
Total$391 $202 $382 
(1)    Impairments of proved properties for the year ended December 31, 2024, were primarily due to the write-down to fair value of natural gas and crude oil assets in the Rocky Mountain area.
(2)    Unproved properties with acquisition costs that are not individually significant are aggregated, and the portion of such costs estimated to be nonproductive is amortized over the remaining lease term. Unproved properties with individually significant acquisition costs are reviewed individually for impairment. See Note 1.