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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Taxes [Abstract] |
Summary of Reconciliation of Income Taxes | Tax rate reconciliation to the Canadian statutory income tax rate
(CAD$ in millions) |  | 2021 |  | 2020
Tax expense (recovery) at the Canadian statutory income tax rate of 26.54% (2020 – 26.58%) |  | $ | 1,203 |  |  | $ | (302) |
Tax effect of: |  |  |  |
Resource taxes |  | 426 |  |  | 106 |
Resource and depletion allowances |  | (61) |  |  | (68) |
Non-deductible expenses (non-taxable income) |  | 69 |  |  | 28 |
Tax pools not recognized (recognition of previously unrecognized tax pools) |  | (56) |  |  | 5 |
Withholding taxes on foreign earnings |  | 60 |  |  | 40 |
Difference in tax rates in foreign jurisdictions |  | 15 |  |  | 1 |
Revisions to prior year estimates |  | (14) |  |  | (4) |
Non-controlling interests |  | (15) |  |  | (2) |
Other |  | (10) |  |  | 4 |
Total income taxes |  | $ | 1,617 |  |  | $ | (192) |
Represented by: |  |  |  |
Current income taxes |  | $ | 978 |  |  | $ | 374 |
Deferred income taxes |  | 639 |  |  | (566) |
Total income taxes |  | $ | 1,617 |  |  | $ | (192) |
b) Continuity of deferred tax assets and liabilities
(CAD$ in millions) |  | January 1, 2021 |  | Through Profit (Loss) |  | Through OCI |  | December 31, 2021
Net operating loss and capital loss carryforwards |  | $ | 247 |  |  | $ | (106) |  |  | $ | — |  |  | $ | 141 |
Property, plant and equipment |  | (168) |  |  | (12) |  |  | — |  |  | (180) |
Decommissioning and restoration provisions |  | 158 |  |  | 32 |  |  | — |  |  | 190 |
Other temporary differences |  | 34 |  |  | (19) |  |  | (5) |  |  | 10 |
Deferred income tax assets |  | $ | 271 |  |  | $ | (105) |  |  | $ | (5) |  |  | $ | 161 |
Net operating loss and capital loss carryforwards |  | $ | (1,038) |  |  | $ | 503 |  |  | $ | 3 |  |  | $ | (532) |
Property, plant and equipment |  | 7,369 |  |  | 176 |  |  | 1 |  |  | 7,546 |
Decommissioning and restoration provisions |  | (962) |  |  | (86) |  |  | (2) |  |  | (1,050) |
Unrealized foreign exchange |  | (88) |  |  | 1 |  |  | 2 |  |  | (85) |
Withholding taxes |  | 95 |  |  | 6 |  |  | (1) |  |  | 100 |
Inventories |  | 110 |  |  | 47 |  |  | (1) |  |  | 156 |
Other temporary differences |  | (103) |  |  | (113) |  |  | 54 |  |  | (162) |
Deferred income tax liabilities |  | $ | 5,383 |  |  | $ | 534 |  |  | $ | 56 |  |  | $ | 5,973 |
21. Income Taxes (continued)
(CAD$ in millions) |  | January 1, 2020 |  | Through Profit (Loss) |  | Through OCI |  | December 31, 2020
Net operating loss and capital loss carryforwards |  | $ | 190 |  |  | $ | 57 |  |  | $ | — |  |  | $ | 247 |
Property, plant and equipment |  | (144) |  |  | (22) |  |  | (2) |  |  | (168) |
Decommissioning and restoration provisions |  | 123 |  |  | 35 |  |  | — |  |  | 158 |
Other temporary differences |  | 42 |  |  | (13) |  |  | 5 |  |  | 34 |
Deferred income tax assets |  | $ | 211 |  |  | $ | 57 |  |  | $ | 3 |  |  | $ | 271 |
Net operating loss and capital loss carryforwards |  | $ | (642) |  |  | $ | (408) |  |  | $ | 12 |  |  | $ | (1,038) |
Property, plant and equipment |  | 7,101 |  |  | 294 |  |  | (26) |  |  | 7,369 |
Decommissioning and restoration provisions |  | (637) |  |  | (327) |  |  | 2 |  |  | (962) |
Unrealized foreign exchange |  | (116) |  |  | 11 |  |  | 17 |  |  | (88) |
Withholding taxes |  | 91 |  |  | 6 |  |  | (2) |  |  | 95 |
Inventories |  | 91 |  |  | 19 |  |  | — |  |  | 110 |
Other temporary differences |  | 14 |  |  | (104) |  |  | (13) |  |  | (103) |
Deferred income tax liabilities |  | $ | 5,902 |  |  | $ | (509) |  |  | $ | (10) |  |  | $ | 5,383 |
Summary of Deferred Tax Expense Charged (Credited) to Income Statement | Continuity of deferred tax assets and liabilities
(CAD$ in millions) |  | January 1, 2021 |  | Through Profit (Loss) |  | Through OCI |  | December 31, 2021
Net operating loss and capital loss carryforwards |  | $ | 247 |  |  | $ | (106) |  |  | $ | — |  |  | $ | 141 |
Property, plant and equipment |  | (168) |  |  | (12) |  |  | — |  |  | (180) |
Decommissioning and restoration provisions |  | 158 |  |  | 32 |  |  | — |  |  | 190 |
Other temporary differences |  | 34 |  |  | (19) |  |  | (5) |  |  | 10 |
Deferred income tax assets |  | $ | 271 |  |  | $ | (105) |  |  | $ | (5) |  |  | $ | 161 |
Net operating loss and capital loss carryforwards |  | $ | (1,038) |  |  | $ | 503 |  |  | $ | 3 |  |  | $ | (532) |
Property, plant and equipment |  | 7,369 |  |  | 176 |  |  | 1 |  |  | 7,546 |
Decommissioning and restoration provisions |  | (962) |  |  | (86) |  |  | (2) |  |  | (1,050) |
Unrealized foreign exchange |  | (88) |  |  | 1 |  |  | 2 |  |  | (85) |
Withholding taxes |  | 95 |  |  | 6 |  |  | (1) |  |  | 100 |
Inventories |  | 110 |  |  | 47 |  |  | (1) |  |  | 156 |
Other temporary differences |  | (103) |  |  | (113) |  |  | 54 |  |  | (162) |
Deferred income tax liabilities |  | $ | 5,383 |  |  | $ | 534 |  |  | $ | 56 |  |  | $ | 5,973 |
21. Income Taxes (continued)
(CAD$ in millions) |  | January 1, 2020 |  | Through Profit (Loss) |  | Through OCI |  | December 31, 2020
Net operating loss and capital loss carryforwards |  | $ | 190 |  |  | $ | 57 |  |  | $ | — |  |  | $ | 247 |
Property, plant and equipment |  | (144) |  |  | (22) |  |  | (2) |  |  | (168) |
Decommissioning and restoration provisions |  | 123 |  |  | 35 |  |  | — |  |  | 158 |
Other temporary differences |  | 42 |  |  | (13) |  |  | 5 |  |  | 34 |
Deferred income tax assets |  | $ | 211 |  |  | $ | 57 |  |  | $ | 3 |  |  | $ | 271 |
Net operating loss and capital loss carryforwards |  | $ | (642) |  |  | $ | (408) |  |  | $ | 12 |  |  | $ | (1,038) |
Property, plant and equipment |  | 7,101 |  |  | 294 |  |  | (26) |  |  | 7,369 |
Decommissioning and restoration provisions |  | (637) |  |  | (327) |  |  | 2 |  |  | (962) |
Unrealized foreign exchange |  | (116) |  |  | 11 |  |  | 17 |  |  | (88) |
Withholding taxes |  | 91 |  |  | 6 |  |  | (2) |  |  | 95 |
Inventories |  | 91 |  |  | 19 |  |  | — |  |  | 110 |
Other temporary differences |  | 14 |  |  | (104) |  |  | (13) |  |  | (103) |
Deferred income tax liabilities |  | $ | 5,902 |  |  | $ | (509) |  |  | $ | (10) |  |  | $ | 5,383 |

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