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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