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Credit Facilities, Long-Term Debt and Lease Liabilities - Amounts Outstanding (Details)
$ in Millions, $ in Millions, $ in Millions
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
AUD ($)
Nov. 15, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
AUD ($)
Dec. 06, 2021
CAD ($)
Disclosure of detailed information about borrowings [line items]                
Carrying value $ 3,653       $ 3,267      
Less: current portion of long-term debt (170)       (837)      
Less: current portion of lease liabilities (8)       (7)      
Total current long-term debt and lease liabilities (178)       (844)      
Total non-current credit facilities, long-term debt and lease liabilities 3,475       2,423      
All Borrowings Except Finance Lease Obligations                
Disclosure of detailed information about borrowings [line items]                
Carrying value 3,518       3,167      
Notional amount 3,563       3,198      
Committed syndicated bank facility                
Disclosure of detailed information about borrowings [line items]                
Carrying value 32       0      
Notional amount 33       0      
Term Facility                
Disclosure of detailed information about borrowings [line items]                
Carrying value 396       0      
Notional amount 400       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      
Senior notes | USD                
Disclosure of detailed information about borrowings [line items]                
Notional amount   $ 700       $ 700    
7.8% Senior notes | USD                
Disclosure of detailed information about borrowings [line items]                
Carrying value 533       0      
Notional amount 542       0      
6.5% Senior notes | USD                
Disclosure of detailed information about borrowings [line items]                
Carrying value 401       378      
Notional amount $ 407       383      
4.5% Senior notes                
Disclosure of detailed information about borrowings [line items]                
Carrying value       $ 400        
Interest 4.50% 4.50% 4.50%          
4.5% Senior notes | USD                
Disclosure of detailed information about borrowings [line items]                
Carrying value $ 0       510      
Notional amount 0       511      
Melancthon Wolfe Wind LP bond                
Disclosure of detailed information about borrowings [line items]                
Carrying value 202       235      
Notional amount 203       237      
New Richmond Wind LP bond                
Disclosure of detailed information about borrowings [line items]                
Carrying value 112       120      
Notional amount 113       121      
Kent Hills Wind LP bond                
Disclosure of detailed information about borrowings [line items]                
Carrying value 206       221      
Notional amount $ 209       221      
Interest 4.50% 4.50% 4.50%          
Windrise Wind LP bond                
Disclosure of detailed information about borrowings [line items]                
Carrying value $ 170       171      
Notional amount 173       173     $ 173
Interest               3.41%
Pingston bond                
Disclosure of detailed information about borrowings [line items]                
Carrying value 45       45      
Notional amount 45       45      
TAPC Holdings LP bond (Poplar Creek)                
Disclosure of detailed information about borrowings [line items]                
Carrying value 94       102      
Notional amount         104      
TEC Hedland PTY Ltd bond | AUD                
Disclosure of detailed information about borrowings [line items]                
Carrying value 711       732      
Notional amount 720       742      
TransAlta OCP LP bond                
Disclosure of detailed information about borrowings [line items]                
Carrying value 241       263      
Notional amount 242       265      
Other                
Disclosure of detailed information about borrowings [line items]                
Carrying value 1       4      
Notional amount 1       4      
Big Level & Antrim | USD                
Disclosure of detailed information about borrowings [line items]                
Carrying value 102       106      
Notional amount 108 $ 79     112 88    
Lakeswind | USD                
Disclosure of detailed information about borrowings [line items]                
Carrying value 15       18      
Notional amount 15 11     18 14    
North Carolina Solar | USD                
Disclosure of detailed information about borrowings [line items]                
Carrying value 6       11      
Notional amount 6 $ 5     11 $ 9    
South Hedland Bond | AUD                
Disclosure of detailed information about borrowings [line items]                
Carrying value     $ 786       $ 800  
Finance lease obligation                
Disclosure of detailed information about borrowings [line items]                
Carrying value $ 135       $ 100      
Weighted average | Committed syndicated bank facility                
Disclosure of detailed information about borrowings [line items]                
Interest 4.70% 4.70% 4.70%   0.00% 0.00% 0.00%  
Weighted average | Term Facility                
Disclosure of detailed information about borrowings [line items]                
Interest 6.50% 6.50% 6.50%   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%   0.00% 0.00% 0.00%  
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 | 4.5% Senior notes | USD                
Disclosure of detailed information about borrowings [line items]                
Interest 4.50% 4.50% 4.50%   4.50% 4.50% 4.50%  
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 3.00% 3.00% 3.00%   3.00% 3.00% 3.00%  
Weighted average | TAPC Holdings LP bond (Poplar Creek)                
Disclosure of detailed information about borrowings [line items]                
Interest 8.90% 8.90% 8.90%   4.40% 4.40% 4.40%  
Weighted average | TEC Hedland PTY Ltd bond | 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 | Other                
Disclosure of detailed information about borrowings [line items]                
Interest 5.90% 5.90% 5.90%   5.90% 5.90% 5.90%  
Borrowings effective interest rate 5.98% 5.98% 5.98%          
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%