Six Months Ended June 30,

2025

2024

Asset retirement obligations as of beginning of period

$

807

$

665

Liabilities incurred

21

15

Liabilities settled and divested

(22

)

(16

)

Revision and reclassification of estimated obligation

55

35

Accretion expense on discounted obligation

24

18

Asset retirement obligations as of end of period

885

717

Less current portion

46

26

Asset retirement obligations, long-term

$

839

$

691