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Accumulated Other Comprehensive Earnings | 12 Months Ended
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Dec. 31, 2021
Disclosure of analysis of other comprehensive income by item [abstract] |
Accumulated Other Comprehensive Earnings | Accumulated Other Comprehensive Earnings The components of, and changes in, accumulated other comprehensive earnings are as follows:
| 2021 | 2020
Currency translation adjustment |  |
Opening balance, Jan. 1 | (21) |  | (21) |
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax | (14) |  | (11) |
Gains on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax | — |  | 11 |
Balance, Dec. 31 | (35) |  | (21) |
Cash flow hedges |  |
Opening balance, Jan. 1 | 436 |  | 527 |
Losses on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax(1) | (208) |  | (91) |
Balance, Dec. 31 | 228 |  | 436 |
Employee future benefits |  |
Opening balance, Jan. 1 | (66) |  | (55) |
Net actuarial gains (losses) on defined benefit plans, net of tax(2) | 37 |  | (11) |
Balance, Dec. 31 | (29) |  | (66) |
Other |  |
Opening balance, Jan. 1 | (47) |  | 3 |
Intercompany investments at FVOCI | 29 |  | (50) |
Balance, Dec. 31 | (18) |  | (47) |
Accumulated other comprehensive earnings | 146 |  | 302 |
(1) Net of income tax of $57 million for the year ended Dec. 31, 2021 (2020 — $23 million). (2) Net of income tax of $11 million for the year ended Dec. 31, 2021 (2020 — $3 million).

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