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Other (expense) income (Tables) | 12 Months Ended
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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 |

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