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Credit Facilities, Long-Term Debt and Lease Liabilities - Amounts Outstanding (Details)
$ in Millions, $ in Millions, $ in Millions
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
AUD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
AUD ($)
Disclosure of detailed information about borrowings [line items]            
Carrying value $ 3,808     $ 3,466    
Less: current portion of long-term debt (567)     (526)    
Less: current portion of lease liabilities (5)     (6)    
Total current long-term debt and lease liabilities (572)     (532)    
Total non-current credit facilities, long-term debt and lease liabilities 3,236     2,934    
Trade and other current receivables (767)     (807)    
Committed syndicated bank facility            
Disclosure of detailed information about borrowings [line items]            
Carrying value 143     0    
Notional amount 145     0    
Term Facility            
Disclosure of detailed information about borrowings [line items]            
Carrying value 400     397    
Notional amount 400     400    
Heartland term facility            
Disclosure of detailed information about borrowings [line items]            
Carrying value 224     0    
Notional amount 224     0    
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 569     520    
Notional amount 575     528    
6.5% Senior notes | USD            
Disclosure of detailed information about borrowings [line items]            
Carrying value 426     391    
Notional amount 431     396    
Melancthon Wolfe Wind LP bond            
Disclosure of detailed information about borrowings [line items]            
Carrying value 133     168    
Notional amount 134     169    
New Richmond Wind LP bond            
Disclosure of detailed information about borrowings [line items]            
Carrying value 93     103    
Notional amount 94     104    
Kent Hills Wind LP bond            
Disclosure of detailed information about borrowings [line items]            
Carrying value 179     193    
Notional amount $ 182     196    
Interest 4.50% 4.50% 4.50%      
Windrise Wind LP bond            
Disclosure of detailed information about borrowings [line items]            
Carrying value $ 157     164    
Notional amount 160     167    
Pingston bond            
Disclosure of detailed information about borrowings [line items]            
Carrying value 39     39    
Notional amount 39     39    
TAPC Holdings LP bond (Poplar Creek)            
Disclosure of detailed information about borrowings [line items]            
Carrying value 75     85    
Notional amount       86    
TEC Hedland PTY Ltd bond(5) | AUD            
Disclosure of detailed information about borrowings [line items]            
Carrying value 675     691    
Notional amount 683     699    
TransAlta OCP LP bond            
Disclosure of detailed information about borrowings [line items]            
Carrying value 192     217    
Notional amount 193     218    
Big Level & Antrim | USD            
Disclosure of detailed information about borrowings [line items]            
Carrying value 90     91    
Notional amount 94 $ 65   97 $ 73  
Lakeswind | USD            
Disclosure of detailed information about borrowings [line items]            
Carrying value 7     10    
Notional amount 7 5   10 8  
North Carolina Solar | USD            
Disclosure of detailed information about borrowings [line items]            
Carrying value 4     3    
Notional amount 4 3   3 2  
Total long-term debt            
Disclosure of detailed information about borrowings [line items]            
Carrying value 3,657     3,323    
Notional amount 3,692     3,363    
Lease liabilities            
Disclosure of detailed information about borrowings [line items]            
Carrying value $ 151     $ 143    
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     $ 761     $ 773
Weighted average | Committed syndicated bank facility            
Disclosure of detailed information about borrowings [line items]            
Interest 5.30% 5.30% 5.30% 0.00% 0.00% 0.00%
Weighted average | Term Facility            
Disclosure of detailed information about borrowings [line items]            
Interest 5.60% 5.60% 5.60% 7.40% 7.40% 7.40%
Weighted average | Heartland term facility            
Disclosure of detailed information about borrowings [line items]            
Interest 6.60% 6.60% 6.60% 0.00% 0.00% 0.00%
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% 6.20% 6.20% 6.20%
Weighted average | TAPC Holdings LP bond (Poplar Creek)            
Disclosure of detailed information about borrowings [line items]            
Interest 8.30% 8.30% 8.30% 9.40% 9.40% 9.40%
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]            
Borrowings effective interest rate 5.98% 5.98% 5.98%