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Other (expense) income (Tables)
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
Schedule of other (expense) income
FOR THE YEAR ENDED DECEMBER 31 NOTE 2020 2019
Losses on retirements and disposals of property, plant and equipment and intangible assets (83) (9)
Net mark-to-market (losses) gains on derivatives used to economically hedge equity settled share-based compensation plans (51) 138 
Early debt redemption costs 24 (50) (18)
Equity gains (losses) from investments in associates and joint ventures 19
Gain (loss) on investment 43  (53)
Operations (38) (19)
Gains on investments 3  18 
Other (18) 38 
Total other (expense) income (194) 95