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Income Taxes (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule Of Income Tax [Line Items] |  |  |  |
Current income tax expense | [1] | $ 140 | $ (14) | $ (58)
Deferred income tax expense | [1] | (294) | 773 | 150
Total income tax expense | [1],[2] | $ (154) | $ 759 | $ 92
Statutory corporate tax rate (percent) |  | 26.00% | 26.90% | 26.90%
Disposals | [3] | (0.60%) | (0.30%) | (5.30%)
Enacted tax rate change | [1] | (31.90%) |  | 0.90%
Other | [4] | (1.00%) | (1.90%) | (6.60%)
Effective income tax rate |  | (7.50%) | 24.70% | 15.90%
[1] | On June 28, 2019 the Alberta government enacted a 4 percent decrease in the provincial tax rate, from 12 percent to 8 percent by 2022. On November 2, 2017 the British Columbia government enacted a 1 percent increase in the provincial tax rate from 11 percent to 12 percent.
[2] | Segment results in 2019 include a largely non-cash favourable impact of $662 million associated with the Alberta corporate income tax rate decrease, with the largest impact in the Upstream segment.
[3] | 2017 disposals were primarily associated with the sale of surplus property in Ontario.
[4] | Other decreases in 2017 and 2018 were primarily related to prior year adjustments and re-assessments.

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