RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Effects on Earnings and Comprehensive Income (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount of unrealized gain/(loss) recognized in OCI	$ 1,062	$ 191	$ (579)
Amount (gain)/loss reclassified from AOCI to earnings	$ 203	304	256
Period to hedge exposures to the variability of cash flows for all forecasted transactions	36 months
Realized loss on derivative	$ (431)	59	265
Unrealized gain (loss) on derivatives	(1,280)	173	756
Cash flow hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Estimated gain of AOCI related to cash flow hedges reclassified to earnings in the next 12 months	67
Foreign exchange contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount (gain)/loss reclassified from AOCI to earnings	13	5	5
Foreign exchange contracts \| Cash flow hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount of unrealized gain/(loss) recognized in OCI	3	(29)	(1)
Foreign exchange contracts \| Fair value hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount of unrealized gain/(loss) recognized in OCI	(35)	(5)	5
Foreign exchange contracts \| Net investment hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount of unrealized gain/(loss) recognized in OCI	0	0	13
Interest rate contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount (gain)/loss reclassified from AOCI to earnings	186	296	253
Interest rate contracts \| Cash flow hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount of unrealized gain/(loss) recognized in OCI	1,151	252	(595)
Interest rate contracts \| Fair value hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain on derivative	262	8
Unrealized loss on hedged item	(254)	(15)
Realized loss on derivative	(110)	(41)
Realized gain on hedged item	85	45
Commodity contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount (gain)/loss reclassified from AOCI to earnings	0	1	0
Commodity contracts \| Cash flow hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount of unrealized gain/(loss) recognized in OCI	(53)	(28)	2
Other contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount (gain)/loss reclassified from AOCI to earnings	4	2	(2)
Other contracts \| Cash flow hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount of unrealized gain/(loss) recognized in OCI	(4)	1	(3)
Non- Qualifying Derivative Instruments
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	(1,280)	173	756
Non- Qualifying Derivative Instruments \| Foreign exchange contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	(1,344)	92	902
Non- Qualifying Derivative Instruments \| Foreign exchange contracts \| Transportation and other services
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	(238)	98	533
Non- Qualifying Derivative Instruments \| Foreign exchange contracts \| Other income/(expense)
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	(1,106)	(6)	369
Non- Qualifying Derivative Instruments \| Interest rate contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	10	2	(25)
Non- Qualifying Derivative Instruments \| Commodity contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	50	71	(114)
Non- Qualifying Derivative Instruments \| Commodity contracts \| Transportation and other services
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	13	9	(2)
Non- Qualifying Derivative Instruments \| Commodity contracts \| Commodity sales
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	89	160	(321)
Non- Qualifying Derivative Instruments \| Commodity contracts \| Commodity costs
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	(102)	(105)	207
Non- Qualifying Derivative Instruments \| Commodity contracts \| Operating and administrative expense
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	50	7	2
Non- Qualifying Derivative Instruments \| Other contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain (loss) on derivatives	$ 4	$ 8	$ (7)

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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