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Income Taxes - Reconciliation of Effective Tax Rate (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
INCOME TAXES. |  |
Earnings before income tax | CAD 5,916.0 | CAD 86.0
Canadian statutory tax rate | 27.01% | 27.00%
Statutory tax | CAD 1,598.0 | CAD 23.0
Non-taxable component of capital gains | (90.0) | (60.0)
Share-based compensation and other permanent items | (1.0) | 19.0
Assessments and adjustments | (11.0) | (2.0)
Impact of income tax rate and legislative changes | (106.0) | (190.0)
Foreign tax rate differential | 180.0 | (28.0)
Non-taxable component of dispositions | (41.0) |
Tax gains for which no deferred income tax asset was recognized | (51.0) | (50.0)
Recognition of deferred income tax asset previously unrecognized |  | (76.0)
Other | (20.0) | 5.0
Total tax expense (income) | CAD 1,458.0 | CAD (359.0)

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