INCOME TAXES - RATE RECONCILIATION (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
INCOME TAX RATE RECONCILIATION
Earnings before income taxes	$ 4,190	$ 7,535	$ 3,570
Canadian federal statutory income tax rate	15.00%	15.00%	15.00%
Expected federal taxes at statutory rate	$ 629	$ 1,130	$ 536
Increase/(decrease) resulting from:
Provincial and state income taxes	288	415	(24)
Foreign and other statutory rate differentials	(53)	129	94
Impact of US tax reform	0	0	(2)
Effects of rate-regulated accounting	(145)	(63)	(163)
Foreign allowable interest deductions	(4)	(29)	(134)
Part VI.1 tax, net of federal Part I deduction	76	78	76
Impairment of goodwill	0	0	192
US BEAT	44	67	43
Non-taxable portion of gain on sale of investment to unrelated party	0	0	31
Valuation allowance	(6)	26	(172)
Intercorporate investments	0	(14)	(149)
Noncontrolling interests	(8)	(13)	(47)
Other	(47)	(18)	(44)
Income tax expense	$ 774	$ 1,708	$ 237
Effective income tax rate (as a percent)	18.50%	22.70%	6.60%

Effective Income Tax Rate Reconciliation, Base Erosion and Anti-abuse Tax, Amount

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