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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
INCOME TAXES |
Income Tax (Recovery) Expense |
($ millions) |  | 2018 |  | 2017 |  |
Current: |  |  |  |  |  |
| Current year |  | 1 270 |  | 1 150 |  |
| Adjustments to current income tax of prior years |  | (20 | ) | 59 |  |
Deferred: |  |  |  |  |  |
| Origination and reversal of temporary differences |  | 345 |  | 476 |  |
| Adjustments in respect of deferred income tax of prior years |  | 13 |  | (70 | ) |
| Changes in tax rates and legislation |  | — |  | (106 | ) |
| Movement in unrecognized deferred income tax assets |  | 82 |  | (51 | ) |
Total income tax expense |  | 1 690 |  | 1 458 |  |
Reconciliation of Effective Tax Rate |
($ millions) |  | 2018 |  | 2017 |  |
Earnings before income tax |  | 4 983 |  | 5 916 |  |
Canadian statutory tax rate |  | 27.04% |  | 27.01% |  |
Statutory tax |  | 1 347 |  | 1 598 |  |
Add (deduct) the tax effect of: |  |  |  |  |  |
| Non-taxable component of capital losses (gains) |  | 146 |  | (90 | ) |
| Share-based compensation and other permanent items |  | 31 |  | (1 | ) |
| Assessments and adjustments |  | (7 | ) | (11 | ) |
| Impact of income tax rate and legislative changes |  | — |  | (106 | ) |
| Foreign tax rate differential |  | 111 |  | 180 |  |
| Non-taxable component of acquisitions and dispositions |  | (14 | ) | (41 | ) |
| Movement in unrecognized deferred income tax assets |  | 82 |  | (51 | ) |
| Other |  | (6 | ) | (20 | ) |
Total income tax expense |  | 1 690 |  | 1 458 |  |
Effective tax rate |  | 33.9% |  | 24.6% |  |
Deferred Income Tax Balances |
|  | Deferred Income Tax Expense (Recovery) |  | Deferred Income Tax Liability (Asset) |  |
($ millions) |  | 2018 |  | 2017 |  | December 31 2018 |  | December 31 2017 |  |
Property, plant and equipment |  | 484 |  | 157 |  | 14 705 |  | 14 252 |  |
Decommissioning and restoration provision |  | 46 |  | 19 |  | (1 854 | ) | (1 910 | ) |
Employee retirement benefit plans |  | 15 |  | (5 | ) | (585 | ) | (639 | ) |
Tax loss carry-forwards |  | (63 | ) | — |  | (172 | ) | (109 | ) |
Other |  | (42 | ) | 78 |  | (177 | ) | (161 | ) |
Net deferred income tax expense and liability |  | 440 |  | 249 |  | 11 917 |  | 11 433 |  |
Change in Deferred Income Tax Balances |
($ millions) |  | 2018 |  | 2017 |  |
Net deferred income tax liability, beginning of year |  | 11 433 |  | 11 180 |  |
Recognized in deferred income tax expense |  | 440 |  | 249 |  |
Recognized in other comprehensive income |  | 39 |  | 19 |  |
Foreign exchange, disposition and other |  | 5 |  | (15 | ) |
Net deferred income tax liability, end of year |  | 11 917 |  | 11 433 |  |
Deferred Tax in Shareholders' Equity |
($ millions) |  | 2018 |  | 2017 |
Deferred Tax in Other Comprehensive Income |  |  |  |  |
| Actuarial gain on employment retirement benefit plans |  | 39 |  | 19 |
Total income tax expense reported in equity |  | 39 |  | 19 |

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