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INCOME TAXES - RATE RECONCILIATION (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
INCOME TAX RATE RECONCILIATION |  |  |  |  |
Earnings before income taxes |  |  | $ 7,535 | $ 3,570 | $ 569
Canadian federal statutory income tax rate |  |  | 15.00% | 15.00% | 15.00%
Expected federal taxes at statutory rate |  |  | $ 1,130 | $ 536 | $ 85
Increase/(decrease) resulting from: |  |  |  |  |
Provincial and state income taxes |  |  | 415 | (24) | 133
Foreign and other statutory rate differentials |  |  | 129 | 94 | (601)
Impact of United States tax reform | $ (223) | $ (30) | 0 | (2) | (2,045)
Effects of rate-regulated accounting |  |  | (63) | (163) | (189)
Foreign allowable interest deductions |  |  | (29) | (134) | (124)
Part VI.1 tax, net of federal Part I deduction |  |  | 78 | 76 | 68
Impairment of goodwill |  |  | 0 | 192 | 15
United States BEAT tax |  |  | 67 | 43 | 0
Non-taxable portion of gain on sale of investment to unrelated party |  |  | 0 | 31 | 0
Valuation allowance |  |  | 26 | (172) | (17)
Intercorporate investments |  |  | (14) | (149) | 77
Noncontrolling interests |  |  | (13) | (47) | (80)
Other |  |  | (18) | (44) | (19)
Income tax (recovery)/expense |  |  | $ 1,708 | $ 237 | $ (2,697)
Effective income tax rate (as a percent) |  |  | 22.70% | 6.60% | (474.00%)

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