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Intangible Assets
12 Months Ended
Dec. 31, 2024
Disclosure of detailed information about intangible assets [abstract]  
Intangible Assets Intangible Assets
A reconciliation of the changes in the carrying amount of intangible assets is as follows:
 
Power sale and other
contracts
Software
and other
Intangibles under
development
Coal rightsTotal
Cost     
As at Dec. 31, 2022
272 437 27 132 868 
Additions
— — 13 — 13 
Asset impairment charges (Note 7)
— (1)— — (1)
Change in foreign exchange rates(2)(2)(1)— (5)
Transfers— 12 (12)— — 
As at Dec. 31, 2023
270 446 27 132 875 
Additions— — 10 — 10 
Acquisitions (Note 4)
57  —  57 
Change in foreign exchange rates5 7 1 — 13 
Transfers20 35 (33)— 22 
As at Dec. 31, 2024
352 488 5 132 977 
Accumulated amortization
As at Dec. 31, 2022
158 326 — 132 616 
Amortization17 21 — — 38 
Change in foreign exchange rates(1)(1)— — (2)
As at Dec. 31, 2023
174 346 — 132 652 
Amortization19 19   38 
Change in foreign exchange rates4 3   7 
Transfers
 (1)  (1)
As at Dec. 31, 2024
197 367  132 696 
Carrying amount     
As at Dec. 31, 2022
114 111 27 — 252 
As at Dec. 31, 2023
96 100 27 — 223 
As at Dec. 31, 2024
155 121 5  281