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Intangible Assets
 12 Months Ended
Dec. 31, 2023
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
contracts
Software
and other
Intangibles under
development
Coal rightsTotal
Cost     
As at Dec. 31, 2021
269 422 4 132 827 
Additions
— — 31 — 31 
Change in foreign exchange rates3 3 1 — 7 
Transfers— 12 (9)— 3 
As at Dec. 31, 2022
272 437 27 132 868 
Additions— — 13 — 13 
Asset impairment charges— (1)— — (1)
Change in foreign exchange rates(2)(2)(1)— (5)
Transfers— 12 (12)— — 
As at Dec. 31, 2023
270 446 27 132 875 
Accumulated amortization
As at Dec. 31, 2021140 299 — 132 571 
Amortization17 26 — — 43 
Change in foreign exchange rates1 1 — — 2 
As at Dec. 31, 2022158 326 — 132 616 
Amortization17 21 — — 38 
Change in foreign exchange rates(1)(1)— — (2)
As at Dec. 31, 2023174 346 — 132 652 
Carrying amount     
As at Dec. 31, 2021
129 123 4 — 256 
As at Dec. 31, 2022114 111 27 — 252 
As at Dec. 31, 2023
96 100 27 — 223