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Product Warranty (Tables)
 12 Months Ended
Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability [Table Text Block] The activity in warranty reserves is summarized in the following table (dollars in millions):
Year Ended December 31,
2024
2023
Beginning balance$8 $8 
Changes in warranty provision— 1 
Payments made(1)(2)
Total warranty reserves6 8 
Current portion of warranty reserves(2)(2)
Long-term portion of warranty reserves$5 $6