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Other Noncurrent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2024
Other Liabilities Disclosure [Abstract]  
Other Noncurrent Liabilities
Other non-current liabilities consisted of the following:
December 31, 2024December 31, 2023
Asset retirement obligations$84 $84 
Accrued environmental expense, long-term21 12 
Other53 20 
Other non-current liabilities$158 $116 
Schedule of Change in Asset Retirement Obligation Changes in the carrying amount of asset retirement obligations for the years ended December 31, 2024 and 2023 were as follows:
Year Ended December 31,
20242023
Balance at beginning of year$84 $81 
Liabilities incurred4 — 
Liabilities settled(8)(1)
Accretion expense4 4 
Balance at end of year$84 $84