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Credit Facilities, Long-Term Debt and Lease Liabilities - Amounts Outstanding (Details)
$ in Millions, $ in Millions, $ in Millions
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
AUD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
AUD ($)
Nov. 15, 2022
CAD ($)
Disclosure of detailed information about borrowings [line items]              
Carrying value $ 3,466     $ 3,653      
Less: current portion of long-term debt (526)     (170)      
Less: current portion of lease liabilities (6)     (8)      
Total current long-term debt and lease liabilities (532)     (178)      
Total non-current credit facilities, long-term debt and lease liabilities 2,934     3,475      
Within one year              
Disclosure of detailed information about borrowings [line items]              
Lease incentive 12            
TAPC Holdings LP bond (Poplar Creek) | Interest rate risk              
Disclosure of detailed information about borrowings [line items]              
Notional amount 86     95      
Committed syndicated bank facility              
Disclosure of detailed information about borrowings [line items]              
Carrying value 0     32      
Notional amount 0     33      
Term Facility              
Disclosure of detailed information about borrowings [line items]              
Carrying value 397     396      
Notional amount 400     400      
7.3% Medium term notes              
Disclosure of detailed information about borrowings [line items]              
Carrying value 110     110      
Notional amount 110     110      
6.9% Medium term notes              
Disclosure of detailed information about borrowings [line items]              
Carrying value 141     141      
Notional amount 141     141      
7.8% Senior notes | USD              
Disclosure of detailed information about borrowings [line items]              
Carrying value 520     533      
Notional amount 528     542      
6.5% Senior notes | USD              
Disclosure of detailed information about borrowings [line items]              
Carrying value 391     401      
Notional amount $ 396     407      
4.5% Senior notes              
Disclosure of detailed information about borrowings [line items]              
Carrying value             $ 400
Interest 4.50% 4.50% 4.50%        
Melancthon Wolfe Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value $ 168     202      
Notional amount 169     203      
New Richmond Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value 103     112      
Notional amount 104     113      
Kent Hills Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value 193     206      
Notional amount $ 196     209      
Interest 4.50% 4.50% 4.50%        
Windrise Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value $ 164     170      
Notional amount 167     173      
Pingston bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value 39     45      
Notional amount 39     45      
TAPC Holdings LP bond (Poplar Creek)              
Disclosure of detailed information about borrowings [line items]              
Carrying value 85     94      
Notional amount       95      
TEC Hedland PTY Ltd bond(5) | AUD              
Disclosure of detailed information about borrowings [line items]              
Carrying value 691     711      
Notional amount 699     720      
TransAlta OCP LP bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value 217     241      
Notional amount 218     242      
Big Level & Antrim | USD              
Disclosure of detailed information about borrowings [line items]              
Carrying value 91     102      
Notional amount 97 $ 73   108 $ 79    
Lakeswind | USD              
Disclosure of detailed information about borrowings [line items]              
Carrying value 10     15      
Notional amount 10 8   15 11    
North Carolina Solar | USD              
Disclosure of detailed information about borrowings [line items]              
Carrying value 3     6      
Notional amount 3 2   6 5    
Other              
Disclosure of detailed information about borrowings [line items]              
Carrying value 0     1      
Notional amount 0     1      
Total long-term debt              
Disclosure of detailed information about borrowings [line items]              
Carrying value 3,323     3,518      
Notional amount 3,363     3,563      
Lease liabilities              
Disclosure of detailed information about borrowings [line items]              
Carrying value $ 143     $ 135      
Senior notes | USD              
Disclosure of detailed information about borrowings [line items]              
Notional amount   $ 700     $ 700    
South Hedland Bond | AUD              
Disclosure of detailed information about borrowings [line items]              
Carrying value     $ 773     $ 786  
Weighted average | Committed syndicated bank facility              
Disclosure of detailed information about borrowings [line items]              
Interest 0.00% 0.00% 0.00% 4.70% 4.70% 4.70%  
Weighted average | Term Facility              
Disclosure of detailed information about borrowings [line items]              
Interest 7.40% 7.40% 7.40% 6.50% 6.50% 6.50%  
Weighted average | 7.3% Medium term notes              
Disclosure of detailed information about borrowings [line items]              
Interest 7.30% 7.30% 7.30% 7.30% 7.30% 7.30%  
Weighted average | 6.9% Medium term notes              
Disclosure of detailed information about borrowings [line items]              
Interest 6.90% 6.90% 6.90% 6.90% 6.90% 6.90%  
Weighted average | 7.8% Senior notes | USD              
Disclosure of detailed information about borrowings [line items]              
Interest 7.80% 7.80% 7.80% 7.80% 7.80% 7.80%  
Weighted average | 6.5% Senior notes | USD              
Disclosure of detailed information about borrowings [line items]              
Interest 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Weighted average | Melancthon Wolfe Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Interest 3.80% 3.80% 3.80% 3.80% 3.80% 3.80%  
Weighted average | New Richmond Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Interest 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%  
Weighted average | Kent Hills Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Interest       4.50% 4.50% 4.50%  
Weighted average | Windrise Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Interest 3.40% 3.40% 3.40% 3.40% 3.40% 3.40%  
Weighted average | Pingston bond              
Disclosure of detailed information about borrowings [line items]              
Interest 6.20% 6.20% 6.20% 3.00% 3.00% 3.00%  
Weighted average | TAPC Holdings LP bond (Poplar Creek)              
Disclosure of detailed information about borrowings [line items]              
Interest 9.40% 9.40% 9.40% 8.90% 8.90% 8.90%  
Weighted average | TEC Hedland PTY Ltd bond(5) | AUD              
Disclosure of detailed information about borrowings [line items]              
Interest 4.10% 4.10% 4.10% 4.10% 4.10% 4.10%  
Weighted average | TransAlta OCP LP bond              
Disclosure of detailed information about borrowings [line items]              
Interest 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%  
Weighted average | Big Level & Antrim | USD              
Disclosure of detailed information about borrowings [line items]              
Interest 6.60% 6.60% 6.60% 6.60% 6.60% 6.60%  
Weighted average | Lakeswind | USD              
Disclosure of detailed information about borrowings [line items]              
Interest 10.50% 10.50% 10.50% 10.50% 10.50% 10.50%  
Weighted average | North Carolina Solar | USD              
Disclosure of detailed information about borrowings [line items]              
Interest 7.30% 7.30% 7.30% 7.30% 7.30% 7.30%  
Weighted average | Other              
Disclosure of detailed information about borrowings [line items]              
Interest 0.00% 0.00% 0.00% 5.90% 5.90% 5.90%  
Borrowings effective interest rate 598.00% 598.00% 598.00%