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Commiments and Contingencies Commiments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2024
Legal and Environmental Matters [Abstract]  
Schedule of Loss Contingencies by Contingency [Table Text Block]
We maintain reserves for various contingent liabilities as follows (dollar amounts in millions):
March 31, 2024December 31, 2023
Environmental reserves$26 $26 
Other reserves— — 
Total contingencies26 26 
Current portion (included in Accounts payable and accrued liabilities)(1)(1)
Long-term portion$25 $25