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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%