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Credit Facilities, Long-Term Debt and Lease Liabilities - Amounts Outstanding (Details)
$ in Millions, $ in Millions, $ in Millions
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
AUD ($)
Dec. 06, 2021
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
AUD ($)
Disclosure of detailed information about borrowings [line items]              
Carrying value $ 3,267       $ 3,361    
Less: current portion of long-term debt (837)       (97)    
Less: current portion of lease liabilities (7)       (8)    
Total current long-term debt and lease liabilities (844)       (105)    
Credit facilities, long-term debt, and finance lease obligations 2,423       3,256    
All Borrowings Except Finance Lease Obligations              
Disclosure of detailed information about borrowings [line items]              
Carrying value 3,167       3,227    
Notional amount 3,198       3,264    
Credit facilities              
Disclosure of detailed information about borrowings [line items]              
Carrying value 0       114    
Notional amount         114    
7.3% Medium term notes              
Disclosure of detailed information about borrowings [line items]              
Carrying value 110       109    
Notional amount 110       110    
6.9% Medium term notes              
Disclosure of detailed information about borrowings [line items]              
Carrying value 141       140    
Notional amount 141       141    
Senior notes | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Notional amount   $ 700       $ 700  
6.5% Senior notes | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Carrying value 378       380    
Notional amount 383       383    
0.045 | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Carrying value 510       506    
Notional amount 511       511    
Melancthon Wolfe Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value 235       268    
Notional amount 237       270    
New Richmond Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value 120       127    
Notional amount 121       128    
Kent Hills Wind LP bond(4)              
Disclosure of detailed information about borrowings [line items]              
Carrying value 221       230    
Notional amount 221       233    
Windrise Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value 171       0    
Notional amount 173       0    
Interest rate       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 102       111    
Notional amount 104       113    
TEC Hedland PTY Ltd bond | Australia, Dollars              
Disclosure of detailed information about borrowings [line items]              
Carrying value 732       772    
Notional amount 742       782    
South Hedland Bond | Australia, Dollars              
Disclosure of detailed information about borrowings [line items]              
Carrying value     $ 800       $ 800
TransAlta OCP LP bond              
Disclosure of detailed information about borrowings [line items]              
Carrying value 263       284    
Notional amount 265       287    
Big Level & Antrim | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Carrying value 106       112    
Notional amount 112 88     119 94  
Lakeswind | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Carrying value 18       22    
Notional amount 18 14     22 16  
North Carolina Solar | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Carrying value 11       0    
Notional amount 11 $ 9     0 $ 0  
Other              
Disclosure of detailed information about borrowings [line items]              
Carrying value 4       7    
Notional amount 4       6    
Finance lease obligation              
Disclosure of detailed information about borrowings [line items]              
Carrying value $ 100       $ 134    
Weighted average | Credit facilities              
Disclosure of detailed information about borrowings [line items]              
Interest rate         2.70% 2.70% 2.70%
Weighted average | 7.3% Medium term notes              
Disclosure of detailed information about borrowings [line items]              
Interest rate 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 rate 6.90% 6.90% 6.90%   6.90% 6.90% 6.90%
Weighted average | 6.5% Senior notes | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Interest rate 6.50% 6.50% 6.50%   6.50% 6.50% 6.50%
Weighted average | 0.045 | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Interest rate 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 rate 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 rate 4.00% 4.00% 4.00%   4.00% 4.00% 4.00%
Weighted average | Kent Hills Wind LP bond(4)              
Disclosure of detailed information about borrowings [line items]              
Interest rate 4.50% 4.50% 4.50%   4.50% 4.50% 4.50%
Weighted average | Windrise Wind LP bond              
Disclosure of detailed information about borrowings [line items]              
Interest rate 3.40% 3.40% 3.40%   0.00% 0.00% 0.00%
Weighted average | Pingston bond              
Disclosure of detailed information about borrowings [line items]              
Interest rate 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 rate 4.40% 4.40% 4.40%   4.50% 4.50% 4.50%
Weighted average | TEC Hedland PTY Ltd bond | Australia, Dollars              
Disclosure of detailed information about borrowings [line items]              
Interest rate 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 rate 4.50% 4.50% 4.50%   4.50% 4.50% 4.50%
Weighted average | Big Level & Antrim | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Interest rate 6.60% 6.60% 6.60%   6.60% 6.60% 6.60%
Weighted average | Lakeswind | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Interest rate 10.50% 10.50% 10.50%   10.50% 10.50% 10.50%
Weighted average | North Carolina Solar | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Interest rate 7.30% 7.30% 7.30%   0.00% 0.00% 0.00%
Weighted average | Other              
Disclosure of detailed information about borrowings [line items]              
Interest rate 5.90% 5.90% 5.90%   5.90% 5.90% 5.90%