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Interest expense
 12 Months Ended
Dec. 31, 2024
Interest expense and foreign exchange  
Interest expense Interest expense
Years Ended December 31 (millions)202420232022
Interest expense
Interest on long-term debt, excluding lease liabilities$94 $104 $25 
Interest on lease liabilities31 24 14 
Amortization of financing fees and other3 3 2 
Interest accretion on provisions
10 13 — 
$138 $144 $41