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Other (Tables)
 12 Months Ended
Dec. 31, 2024
Analysis of income and expense [abstract]  
Other
20242023
Foreign exchange gain (loss)$7 $(7)
Settlement gain (loss) on defined benefit pension plans$(1)$6 
Gain resulting from the CPP agreement1 — 
Gain (loss) on electricity swaps(9)17 
Loss on interest rate swap contracts(4)(6)
Other
4 (5)
$(2)$5