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Other Noncurrent Liabilities
12 Months Ended
Dec. 31, 2023
Other Liabilities Disclosure [Abstract]  
Other Noncurrent Liabilities Other Non-Current Liabilities
Other non-current liabilities consisted of the following:
December 31, 2023December 31, 2022
Asset retirement obligations$84 $81 
Accrued environmental expense, long-term12 12 
Other20 18 
Other non-current liabilities$116 $111 
We record an asset retirement obligation for the estimated future cost to remove underground storage tanks. Revisions to the liability could occur due to changes in tank removal costs, tank useful lives or if federal and/or state regulators enact new guidance on
the removal of such tanks. Changes in the carrying amount of asset retirement obligations for the years ended December 31, 2023 and 2022 were as follows:
Year Ended December 31,
20232022
Balance at beginning of year$81 $79 
Liabilities incurred— — 
Liabilities settled(1)(2)
Accretion expense
Balance at end of year$84 $81