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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes [Abstract] |
Summary of Reconciliation of Income Taxes | Reconciliation of income taxes calculated at the Canadian statutory income tax rate to the actual provision for income taxes is as follows:
(CAD$ in millions) |  | 2019 |  |  | 2018 |
Tax expense (recovery) at the Canadian statutory income tax rate of 26.94% (2018 – 27%) |  | $ | (126 | ) |  | $ | 1,217 |
Tax effect of: |  |  |  |
Resource taxes |  | 226 |  |  | 360 |
Resource and depletion allowances |  | (85 | ) |  | (80 | )
Non-deductible expenses (non-taxable income) |  | (6 | ) |  | (157 | )
Impact of initial recognition exemption related to the Frontier oil sands project |  | 117 |  |  | — |
Tax pools not recognized (recognition of previously unrecognized tax pools) |  | (2 | ) |  | 4 |
Effect due to tax legislative changes |  | (39 | ) |  | — |
Withholding taxes on foreign earnings |  | 39 |  |  | 47 |
Difference in tax rates in foreign jurisdictions |  | (2 | ) |  | 2 |
Revisions to prior year estimates |  | 2 |  |  | (21 | )
Other |  | (4 | ) |  | (7 | )
Total income taxes |  | $ | 120 |  |  | $ | 1,365 |
Represented by: |  |  |  |
Current income taxes |  | $ | 576 |  |  | $ | 691 |
Deferred income taxes |  | (456 | ) |  | 674 |
Total income taxes |  | $ | 120 |  |  | $ | 1,365 |
b) | The continuity related to deferred tax assets and liabilities is as follows:
| (CAD$ in millions) |  | January 1, 2019 1 |  |  | Through Profit or Loss |  |  | Through OCI |  |  | Through Equity |  |  | December 31, 2019 |
| Net operating loss carryforwards |  | $ | 139 |  |  | $ | 54 |  |  | $ | (3 | ) |  | $ | — |  |  | $ | 190 |
| Property, plant and equipment |  | (130 | ) |  | (13 | ) |  | (1 | ) |  | — |  |  | (144 | )
| Decommissioning and restoration provisions |  | 94 |  |  | 29 |  |  | — |  |  | — |  |  | 123 |
| Other temporary differences |  | 57 |  |  | 20 |  |  | (26 | ) |  | (9 | ) |  | 42 |
| Deferred income tax assets |  | $ | 160 |  |  | $ | 90 |  |  | $ | (30 | ) |  | $ | (9 | ) |  | $ | 211 |
| Net operating loss carryforwards |  | $ | (750 | ) |  | $ | 111 |  |  | $ | 3 |  |  | $ | (6 | ) |  | $ | (642 | )
| Property, plant and equipment |  | 7,402 |  |  | (232 | ) |  | (69 | ) |  | — |  |  | 7,101 |
| Decommissioning and restoration provisions |  | (474 | ) |  | (170 | ) |  | 7 |  |  | — |  |  | (637 | )
| U.S. alternative minimum tax credits |  | (38 | ) |  | 37 |  |  | 1 |  |  | — |  |  | — |
| Unrealized foreign exchange |  | (146 | ) |  | 4 |  |  | 26 |  |  | — |  |  | (116 | )
| Withholding taxes |  | 104 |  |  | (8 | ) |  | (5 | ) |  | — |  |  | 91 |
| Inventories |  | 97 |  |  | (5 | ) |  | (1 | ) |  | — |  |  | 91 |
| Other temporary differences |  | 116 |  |  | (103 | ) |  | 1 |  |  | — |  |  | 14 |
| Deferred income tax liabilities |  | $ | 6,311 |  |  | $ | (366 | ) |  | $ | (37 | ) |  | $ | (6 | ) |  | $ | 5,902 |
| (CAD$ in millions) |  | January 1, 2018 |  |  | Through Profit or Loss |  |  | Through OCI |  |  | Through Equity |  |  | December 31, 2018 |
| Net operating loss carryforwards |  | $ | 58 |  |  | $ | 80 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 139 |
| Property, plant and equipment |  | (189 | ) |  | 58 |  |  | 1 |  |  | — |  |  | (130 | )
| Decommissioning and restoration provisions |  | 78 |  |  | 16 |  |  | — |  |  | — |  |  | 94 |
| U.S. alternative minimum tax credits |  | 143 |  |  | (148 | ) |  | 5 |  |  | — |  |  | — |
| Other temporary differences |  | 64 |  |  | (17 | ) |  | 10 |  |  | — |  |  | 57 |
| Deferred income tax assets |  | $ | 154 |  |  | $ | (11 | ) |  | $ | 17 |  |  | $ | — |  |  | $ | 160 |
| Net operating loss carryforwards |  | $ | (1,065 | ) |  | $ | 312 |  |  | $ | 3 |  |  | $ | — |  |  | $ | (750 | )
| Property, plant and equipment |  | 7,390 |  |  | (94 | ) |  | 126 |  |  | — |  |  | 7,422 |
| Decommissioning and restoration provisions |  | (754 | ) |  | 287 |  |  | (7 | ) |  | — |  |  | (474 | )
| U.S. alternative minimum tax credits |  | — |  |  | (38 | ) |  | — |  |  | — |  |  | (38 | )
| Unrealized foreign exchange |  | (135 | ) |  | 29 |  |  | (40 | ) |  | — |  |  | (146 | )
| Withholding taxes |  | 79 |  |  | 18 |  |  | 7 |  |  | — |  |  | 104 |
| Inventories |  | 65 |  |  | 32 |  |  | — |  |  | — |  |  | 97 |
| Other temporary differences |  | (1 | ) |  | 117 |  |  | — |  |  | — |  |  | 116 |
| Deferred income tax liabilities |  | $ | 5,579 |  |  | $ | 663 |  |  | $ | 89 |  |  | $ | — |  |  | $ | 6,331 |
Note:
1. | The January 1, 2019 balance for deferred income tax liabilities related to property, plant and equipment has been adjusted by $20 million for the adoption of IFRS 16 (Note 33).
c) | Deferred Tax Assets and Liabilities Not Recognized
Summary of Deferred Tax Expense Charged (Credited) to Income Statement | The continuity related to deferred tax assets and liabilities is as follows:
| (CAD$ in millions) |  | January 1, 2019 1 |  |  | Through Profit or Loss |  |  | Through OCI |  |  | Through Equity |  |  | December 31, 2019 |
| Net operating loss carryforwards |  | $ | 139 |  |  | $ | 54 |  |  | $ | (3 | ) |  | $ | — |  |  | $ | 190 |
| Property, plant and equipment |  | (130 | ) |  | (13 | ) |  | (1 | ) |  | — |  |  | (144 | )
| Decommissioning and restoration provisions |  | 94 |  |  | 29 |  |  | — |  |  | — |  |  | 123 |
| Other temporary differences |  | 57 |  |  | 20 |  |  | (26 | ) |  | (9 | ) |  | 42 |
| Deferred income tax assets |  | $ | 160 |  |  | $ | 90 |  |  | $ | (30 | ) |  | $ | (9 | ) |  | $ | 211 |
| Net operating loss carryforwards |  | $ | (750 | ) |  | $ | 111 |  |  | $ | 3 |  |  | $ | (6 | ) |  | $ | (642 | )
| Property, plant and equipment |  | 7,402 |  |  | (232 | ) |  | (69 | ) |  | — |  |  | 7,101 |
| Decommissioning and restoration provisions |  | (474 | ) |  | (170 | ) |  | 7 |  |  | — |  |  | (637 | )
| U.S. alternative minimum tax credits |  | (38 | ) |  | 37 |  |  | 1 |  |  | — |  |  | — |
| Unrealized foreign exchange |  | (146 | ) |  | 4 |  |  | 26 |  |  | — |  |  | (116 | )
| Withholding taxes |  | 104 |  |  | (8 | ) |  | (5 | ) |  | — |  |  | 91 |
| Inventories |  | 97 |  |  | (5 | ) |  | (1 | ) |  | — |  |  | 91 |
| Other temporary differences |  | 116 |  |  | (103 | ) |  | 1 |  |  | — |  |  | 14 |
| Deferred income tax liabilities |  | $ | 6,311 |  |  | $ | (366 | ) |  | $ | (37 | ) |  | $ | (6 | ) |  | $ | 5,902 |
| (CAD$ in millions) |  | January 1, 2018 |  |  | Through Profit or Loss |  |  | Through OCI |  |  | Through Equity |  |  | December 31, 2018 |
| Net operating loss carryforwards |  | $ | 58 |  |  | $ | 80 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 139 |
| Property, plant and equipment |  | (189 | ) |  | 58 |  |  | 1 |  |  | — |  |  | (130 | )
| Decommissioning and restoration provisions |  | 78 |  |  | 16 |  |  | — |  |  | — |  |  | 94 |
| U.S. alternative minimum tax credits |  | 143 |  |  | (148 | ) |  | 5 |  |  | — |  |  | — |
| Other temporary differences |  | 64 |  |  | (17 | ) |  | 10 |  |  | — |  |  | 57 |
| Deferred income tax assets |  | $ | 154 |  |  | $ | (11 | ) |  | $ | 17 |  |  | $ | — |  |  | $ | 160 |
| Net operating loss carryforwards |  | $ | (1,065 | ) |  | $ | 312 |  |  | $ | 3 |  |  | $ | — |  |  | $ | (750 | )
| Property, plant and equipment |  | 7,390 |  |  | (94 | ) |  | 126 |  |  | — |  |  | 7,422 |
| Decommissioning and restoration provisions |  | (754 | ) |  | 287 |  |  | (7 | ) |  | — |  |  | (474 | )
| U.S. alternative minimum tax credits |  | — |  |  | (38 | ) |  | — |  |  | — |  |  | (38 | )
| Unrealized foreign exchange |  | (135 | ) |  | 29 |  |  | (40 | ) |  | — |  |  | (146 | )
| Withholding taxes |  | 79 |  |  | 18 |  |  | 7 |  |  | — |  |  | 104 |
| Inventories |  | 65 |  |  | 32 |  |  | — |  |  | — |  |  | 97 |
| Other temporary differences |  | (1 | ) |  | 117 |  |  | — |  |  | — |  |  | 116 |
| Deferred income tax liabilities |  | $ | 5,579 |  |  | $ | 663 |  |  | $ | 89 |  |  | $ | — |  |  | $ | 6,331 |
Note:
1. | The January 1, 2019 balance for deferred income tax liabilities related to property, plant and equipment has been adjusted by $20 million for the adoption of IFRS 16 (Note 33).

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