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INCOME TAXES - DEFERRED INCOME TAXES (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax liabilities |  |
Property, plant and equipment | $ (7,786) | $ (7,290)
Investments | (4,649) | (4,620)
Regulatory assets | (1,156) | (1,052)
Other | (127) | (40)
Total deferred income tax liabilities | (13,718) | (13,002)
Deferred income tax assets |  |
Financial instruments | 518 | 679
Pension and OPEB plans | 251 | 206
Loss carryforwards | 2,005 | 1,693
Other | 1,461 | 1,641
Total deferred income tax assets | 4,235 | 4,219
Less valuation allowance | (79) | (84)
Total deferred income tax assets, net | 4,156 | 4,135
Net deferred income tax liabilities | (9,562) | (8,867)
Deferred income taxes | 770 | 1,000
Total deferred income tax liabilities | (10,332) | (9,867)
Foreign subsidiaries' undistributed earnings on which deferred income taxes has not been provided | 5,500 | 5,300
Canada |  |
Deferred income tax assets |  |
Benefit of unused tax loss carryforwards recognized | 2,600 | 3,200
US |  |
Deferred income tax assets |  |
Benefit of unused tax loss carryforwards recognized | $ 5,800 | $ 3,600

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