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Impairments
12 Months Ended
Dec. 31, 2023
Asset Impairment Charges [Abstract]  
Impairments
Note 7—Impairments
During 2023, 2022 and 2021, we recognized the following before-tax impairment charges:
Millions of Dollars
202320222021
Alaska$ 
Lower 487 (11)(8)
Canada6 (2)
Europe, Middle East and North Africa (1)(24)
Asia Pacific — 695 
Corporate and Other1 — — 
$14 (12)674 

2021
We recorded an impairment of $688 million on our APLNG investment included within the Asia Pacific segment. See Note 4 and Note 13.
In our Lower 48 segment, we recorded a credit to impairment of $89 million due to a decreased ARO estimate for a previously sold asset, in which we retained the ARO liability. This was offset by recorded impairments of $84 million during the fourth quarter of 2021, related to certain noncore assets due to changes in development plans. See Note 13.
In our Europe, Middle East and North Africa segment, we recorded a credit to impairment of $24 million due to decreased ARO estimates on fields in Norway which ceased production and were fully depreciated in prior years.