v3.24.2.u1

financial instruments - Fair Values Derivatives (Details)	6 Months Ended							12 Months Ended
	Jun. 30, 2024 CAD ($)	Jun. 30, 2024 CAD ($)	Jun. 30, 2024 CAD ($) $ / shares	Jun. 30, 2024 CAD ($) ₱ / shares	Jun. 30, 2024 CAD ($) $ / $	Jun. 30, 2024 CAD ($) $ / €	Jun. 30, 2024 CAD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2023 CAD ($) $ / shares	Dec. 31, 2023 CAD ($) ₱ / shares	Dec. 31, 2023 CAD ($) $ / $	Dec. 31, 2023 CAD ($) $ / €	Dec. 31, 2023 CAD ($) € / $	Dec. 31, 2023 CAD ($)	Dec. 31, 2023 CAD ($) TWh
Disclosure of detailed information about financial instruments
Current Assets, Fair value and carrying value	$ 35,000,000	$ 35,000,000	$ 35,000,000	$ 35,000,000	$ 35,000,000	$ 35,000,000	$ 35,000,000	$ 36,000,000	$ 36,000,000	$ 36,000,000	$ 36,000,000	$ 36,000,000	$ 36,000,000	$ 36,000,000	$ 36,000,000	$ 36,000,000
Current Liabilities, Fair value and carrying value	7,000,000	7,000,000	7,000,000	7,000,000	7,000,000	7,000,000	$ 7,000,000	25,000,000	25,000,000	25,000,000	25,000,000	25,000,000	25,000,000	25,000,000	$ 25,000,000	25,000,000
Derivative assets | Cash flow hedging item (HFH)
Disclosure of detailed information about financial instruments
Hedge ratio							1.00%								1.00%
Derivative assets | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars
Disclosure of detailed information about financial instruments
Spread included in fair value of derivative instruments		119,000,000							163,000,000
Derivative assets | Currency risk related to long-term debt | Cash flow hedging item (HFH) | European euro
Disclosure of detailed information about financial instruments
Spread included in fair value of derivative instruments		3,000,000							3,000,000
Current Asset derivatives
Disclosure of detailed information about financial instruments
Current Assets, Fair value and carrying value	$ 35,000,000	35,000,000	35,000,000	35,000,000	35,000,000	35,000,000	$ 35,000,000	$ 36,000,000	36,000,000	36,000,000	36,000,000	36,000,000	36,000,000	36,000,000	$ 36,000,000	36,000,000
Current Asset derivatives | Currency risk related to revenues | HFT | U.S. Dollars
Disclosure of detailed information about financial instruments
Maximum maturity date	2024							2024
Current Assets, Notional amount	$ 14,000,000	14,000,000	$ 14,000,000	$ 14,000,000	14,000,000	14,000,000	14,000,000	$ 111,000,000	111,000,000	111,000,000	111,000,000	111,000,000	111,000,000	111,000,000	111,000,000	111,000,000
Current Assets, Fair value and carrying value								$ 2,000,000	2,000,000	$ 2,000,000	$ 2,000,000	2,000,000	2,000,000	2,000,000	2,000,000	2,000,000
Rate			1.00	59						1.00	56
Current Asset derivatives | Currency risk related to purchases | Cash flow hedging item (HFH) | U.S. Dollars
Disclosure of detailed information about financial instruments
Maximum maturity date	2025							2024
Current Assets, Notional amount	$ 366,000,000	366,000,000	$ 366,000,000	$ 366,000,000	366,000,000	366,000,000	366,000,000	$ 47,000,000	47,000,000	$ 47,000,000	$ 47,000,000	$ 47,000,000	47,000,000	47,000,000	47,000,000	47,000,000
Current Assets, Fair value and carrying value	$ 5,000,000	5,000,000	$ 5,000,000	5,000,000	$ 5,000,000	5,000,000	5,000,000
Rate			1.00		1.35					1.00		1.31
Current Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars
Disclosure of detailed information about financial instruments
Maximum maturity date	2024							2024
Current Assets, Notional amount	$ 1,209,000,000	1,209,000,000	$ 1,209,000,000	1,209,000,000	$ 1,209,000,000	1,209,000,000	1,209,000,000	$ 118,000,000	118,000,000	$ 118,000,000	118,000,000	$ 118,000,000	118,000,000	118,000,000	118,000,000	118,000,000
Current Assets, Fair value and carrying value	$ 7,000,000	7,000,000	$ 7,000,000	7,000,000	$ 7,000,000	7,000,000	7,000,000	$ 1,000,000	1,000,000	$ 1,000,000	1,000,000	$ 1,000,000	1,000,000	1,000,000	1,000,000	1,000,000
Rate			1.00		1.36					1.00		1.31
Current Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | European euro
Disclosure of detailed information about financial instruments
Maximum maturity date	2028							2027
Current Assets, Notional amount	$ 45,000,000	45,000,000	$ 45,000,000	45,000,000	$ 45,000,000	45,000,000	45,000,000	$ 45,000,000	45,000,000	$ 45,000,000	45,000,000	$ 45,000,000	45,000,000	45,000,000	45,000,000	45,000,000
Current Assets, Fair value and carrying value	$ 20,000,000	$ 20,000,000	$ 20,000,000	$ 20,000,000	$ 20,000,000	$ 20,000,000	$ 20,000,000	$ 17,000,000	17,000,000	17,000,000	17,000,000	17,000,000	$ 17,000,000	$ 17,000,000	17,000,000	17,000,000
Rate			1.00			1.09							1.09	1.00
Current Asset derivatives | Interest rate risk | Cash flow hedging item (HFH) | 2.98% non-fixed rate credit facility
Disclosure of detailed information about financial instruments
Interest rate on borrowings	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%
Current Asset derivatives | Interest rate risk | Cash flow hedging item (HFH) | 3.5% non-fixed rate credit facility
Disclosure of detailed information about financial instruments
Maximum maturity date	2028							2024
Current Assets, Notional amount	$ 12,000,000	$ 12,000,000	$ 12,000,000	$ 12,000,000	$ 12,000,000	$ 12,000,000	$ 12,000,000	$ 11,000,000	11,000,000	11,000,000	11,000,000	11,000,000	$ 11,000,000	$ 11,000,000	11,000,000	11,000,000
Current Assets, Fair value and carrying value	$ 3,000,000	$ 3,000,000	$ 3,000,000	$ 3,000,000	$ 3,000,000	$ 3,000,000	$ 3,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000
Interest rate on borrowings	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%
Current Asset derivatives | Price risk associated with purchase of electrical power | HFT
Disclosure of detailed information about financial instruments
Maximum maturity date	2047							2047
Current Assets, Notional amount								$ 25,000,000	$ 25,000,000	$ 25,000,000	$ 25,000,000	$ 25,000,000	$ 25,000,000	$ 25,000,000	$ 25,000,000	$ 25,000,000
Current Assets, Fair value and carrying value								14,000,000	14,000,000	14,000,000	14,000,000	14,000,000	14,000,000	14,000,000	14,000,000	$ 14,000,000
Electrical consumption commodity derivative, Notional amount (in TWh) | TWh																0.4
Electrical consumption commodity derivative, Price (CAD/MWh).		$ 31.18							30.60
Other Long-Term Asset derivatives
Disclosure of detailed information about financial instruments
Other Long-Term Assets, Fair value and carrying value	$ 121,000,000	121,000,000	$ 121,000,000	$ 121,000,000	$ 121,000,000	$ 121,000,000	$ 121,000,000	$ 179,000,000	179,000,000	179,000,000	179,000,000	179,000,000	179,000,000	179,000,000	$ 179,000,000	$ 179,000,000
Other Long-Term Asset derivatives | Cash flow hedging item (HFH) | U.S. Dollars
Disclosure of detailed information about financial instruments
Rate | $ / $					1.29
Other Long-Term Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH)
Disclosure of detailed information about financial instruments
Hedge ratio							1.00%								1.00%
Other Long-Term Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars
Disclosure of detailed information about financial instruments
Maximum maturity date	2048
Rate | $ / shares			1.00
Other Long-Term Assets, Notional amount	$ 3,635,000,000	3,635,000,000	$ 3,635,000,000	3,635,000,000	$ 3,635,000,000	3,635,000,000	$ 3,635,000,000
Other Long-Term Assets, Fair value and carrying value	$ 20,000,000	20,000,000	20,000,000	20,000,000	20,000,000	$ 20,000,000	20,000,000
Other Long-Term Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | European euro
Disclosure of detailed information about financial instruments
Maximum maturity date	2028
Rate | $ / €						1.09
Other Long-Term Assets, Notional amount	$ 569,000,000	569,000,000	569,000,000	569,000,000	569,000,000	$ 569,000,000	569,000,000
Other Long-Term Assets, Fair value and carrying value	$ 10,000,000	10,000,000	10,000,000	10,000,000	10,000,000	10,000,000	10,000,000
Other Long-Term Asset derivatives | Interest rate risk | Cash flow hedging item (HFH) | 3.5% non-fixed rate credit facility
Disclosure of detailed information about financial instruments
Maximum maturity date	2028
Other Long-Term Assets, Notional amount	$ 206,000,000	206,000,000	206,000,000	206,000,000	206,000,000	206,000,000	206,000,000
Other Long-Term Assets, Fair value and carrying value	$ 1,000,000	$ 1,000,000	$ 1,000,000	$ 1,000,000	$ 1,000,000	$ 1,000,000	$ 1,000,000
Interest rate on borrowings	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%
Other Long-Term Asset derivatives | Price risk associated with purchase of electrical power | HFT
Disclosure of detailed information about financial instruments
Maximum maturity date	2047							2047
Price		$ 40.00
Other Long-Term Assets, Notional amount								$ 672,000,000	672,000,000	672,000,000	672,000,000	672,000,000	672,000,000	672,000,000	$ 672,000,000	672,000,000
Other Long-Term Assets, Fair value and carrying value	$ 90,000,000	90,000,000	$ 90,000,000	$ 90,000,000	$ 90,000,000	$ 90,000,000	$ 90,000,000	179,000,000	179,000,000	179,000,000	179,000,000	179,000,000	179,000,000	179,000,000	179,000,000	$ 179,000,000
Electrical consumption commodity derivative, Notional amount (in TWh) | TWh																6.9
Electrical consumption commodity derivative, Price (CAD/MWh).									39.52
Current Liabilities derivatives
Disclosure of detailed information about financial instruments
Current Liabilities, Fair value and carrying value	$ 7,000,000	7,000,000	$ 7,000,000	$ 7,000,000	7,000,000	7,000,000	7,000,000	$ 25,000,000	25,000,000	$ 25,000,000	$ 25,000,000	25,000,000	25,000,000	25,000,000	25,000,000	$ 25,000,000
Current Liabilities derivatives | Currency risk related to revenues | HFT | U.S. Dollars
Disclosure of detailed information about financial instruments
Maximum maturity date	2025							2024
Rate			1.00	57						1.00	55
Current Liabilities, Notional amount	$ 163,000,000	163,000,000	$ 163,000,000	$ 163,000,000	163,000,000	163,000,000	163,000,000	$ 18,000,000	18,000,000	$ 18,000,000	$ 18,000,000	$ 18,000,000	18,000,000	18,000,000	18,000,000	18,000,000
Current Liabilities, Fair value and carrying value	$ 6,000,000	6,000,000	$ 6,000,000	6,000,000	$ 6,000,000	6,000,000	6,000,000
Current Liabilities derivatives | Currency risk related to purchases | Cash flow hedging item (HFH) | U.S. Dollars
Disclosure of detailed information about financial instruments
Maximum maturity date	2025							2024
Rate			1.00		1.36					1.00		1.34
Current Liabilities, Notional amount	$ 31,000,000	31,000,000	$ 31,000,000	31,000,000	$ 31,000,000	31,000,000	31,000,000	$ 401,000,000	401,000,000	$ 401,000,000	401,000,000	$ 401,000,000	401,000,000	401,000,000	401,000,000	401,000,000
Current Liabilities, Fair value and carrying value								$ 7,000,000	7,000,000	$ 7,000,000	7,000,000	$ 7,000,000	7,000,000	7,000,000	7,000,000	7,000,000
Current Liabilities derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars
Disclosure of detailed information about financial instruments
Maximum maturity date	2024							2024
Rate			1.00		1.37					1.00		1.35
Current Liabilities, Notional amount	$ 1,623,000,000	1,623,000,000	$ 1,623,000,000	1,623,000,000	$ 1,623,000,000	1,623,000,000	1,623,000,000	$ 943,000,000	943,000,000	$ 943,000,000	943,000,000	$ 943,000,000	943,000,000	943,000,000	943,000,000	943,000,000
Current Liabilities, Fair value and carrying value	1,000,000	1,000,000	1,000,000	1,000,000	1,000,000	1,000,000	1,000,000	18,000,000	18,000,000	18,000,000	18,000,000	18,000,000	18,000,000	18,000,000	18,000,000	18,000,000
Other Long-Term Liabilities derivatives
Disclosure of detailed information about financial instruments
Other Long-Term Liabilities, Fair value and carrying value	$ 50,000,000	50,000,000	$ 50,000,000	50,000,000	$ 50,000,000	50,000,000	50,000,000	$ 191,000,000	191,000,000	$ 191,000,000	191,000,000	$ 191,000,000	191,000,000	191,000,000	191,000,000	191,000,000
Other Long-Term Liabilities derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars
Disclosure of detailed information about financial instruments
Maximum maturity date	2049							2049
Rate			1.00		1.33					1.00		1.31
Other Long-Term Liabilities, Notional amount	$ 2,893,000,000	2,893,000,000	$ 2,893,000,000	2,893,000,000	$ 2,893,000,000	2,893,000,000	2,893,000,000	$ 6,610,000,000	6,610,000,000	$ 6,610,000,000	6,610,000,000	$ 6,610,000,000	6,610,000,000	6,610,000,000	6,610,000,000	6,610,000,000
Other Long-Term Liabilities, Fair value and carrying value	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 176,000,000	176,000,000	176,000,000	176,000,000	176,000,000	$ 176,000,000	$ 176,000,000	176,000,000	176,000,000
Other Long-Term Liabilities derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | European euro
Disclosure of detailed information about financial instruments
Maximum maturity date								2027
Rate													1.09	1.00
Other Long-Term Liabilities, Notional amount								$ 591,000,000	591,000,000	591,000,000	591,000,000	591,000,000	$ 591,000,000	$ 591,000,000	591,000,000	591,000,000
Other Long-Term Liabilities, Fair value and carrying value								$ 13,000,000	13,000,000	13,000,000	13,000,000	13,000,000	13,000,000	13,000,000	13,000,000	13,000,000
Other Long-Term Liabilities derivatives | Interest rate risk | Cash flow hedging item (HFH) | 3.5% non-fixed rate credit facility
Disclosure of detailed information about financial instruments
Maximum maturity date								2028
Other Long-Term Liabilities, Notional amount								$ 205,000,000	205,000,000	205,000,000	205,000,000	205,000,000	205,000,000	205,000,000	205,000,000	205,000,000
Other Long-Term Liabilities, Fair value and carrying value								$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000
Interest rate on borrowings								3.60%	3.60%	3.60%	3.60%	3.60%	3.60%	3.60%	3.60%	3.60%

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

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The notional amount of the electrical consumption commodity derivative to purchase solar energy, expressed in megawatt hours (MWh).

+ References

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