RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - EFFECTS ON EARNINGS AND COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount of unrealized gain/(loss) recognized in OCI	$ 191	$ (579)	$ (591)
Amount (gain)/loss reclassified from AOCI to earnings	$ 304	256	158
Period to hedge exposures to the variability of cash flows for all forecasted transactions	36 months
Realized loss on derivative	$ 59	265	346
Unrealized gain/(loss) on derivative	173	756	1,751
Cash Flow Hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Estimated loss of AOCI related to cash flow hedges reclassified to earnings in the next 12 months	47
Foreign exchange contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount (gain)/loss reclassified from AOCI to earnings	5	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	(29)	(1)	(19)
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	(5)	5	0
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	13	2
Interest rate contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount (gain)/loss reclassified from AOCI to earnings	296	253	157
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	252	(595)	(559)
Interest rate contracts \| Fair Value Hedges
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain/(loss) on derivative	8	(116)
Unrealized gain/(loss) on hedged item	(15)	133
Realized loss on derivative	(41)	(12)
Realized gain on hedged item	45	0
Commodity contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount (gain)/loss reclassified from AOCI to earnings	1	0	(1)
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	(28)	2	(25)
Other contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Amount (gain)/loss reclassified from AOCI to earnings	2	(2)	(3)
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	1	(3)	10
Non- Qualifying Derivative Instruments
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain/(loss) on derivative	173	756	1,751
Non- Qualifying Derivative Instruments \| Foreign exchange contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain/(loss) on derivative	92	902	1,626
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 derivative	98	533	930
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 derivative	(6)	369	696
Non- Qualifying Derivative Instruments \| Interest rate contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain/(loss) on derivative	2	(25)	178
Non- Qualifying Derivative Instruments \| Commodity contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain/(loss) on derivative	71	(114)	(62)
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 derivative	9	(2)	(26)
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 derivative	160	(321)	(544)
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 derivative	(105)	207	459
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 derivative	7	2	49
Non- Qualifying Derivative Instruments \| Other contracts
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income
Unrealized gain/(loss) on derivative	$ 8	$ (7)	$ 9

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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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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