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Intangible Assets
 12 Months Ended
Dec. 31, 2022
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, 2020269 412 3 149 833 
Additions— — 9 — 9 
Impairment charges (Note 7)
— — — (17)(17)
Change in foreign exchange rates— (2)— — (2)
Transfers— 12 (8)— 4 
As at Dec. 31, 2021269 422 4 132 827 
Additions(1)
— — 31 — 31 
Change in foreign exchange rates3 3 1 — 7 
Transfers— 12 (9)— 3 
As at Dec. 31, 2022272 437 27 132 868 
Accumulated amortization     
As at Dec. 31, 2020123 272 — 125 520 
Amortization17 27 — 7 51 
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 
Carrying amount     
As at Dec. 31, 2020146 140 3 24 313 
As at Dec. 31, 2021129 123 4 — 256 
As at Dec. 31, 2022114 111 27 — 252 
(1)    In 2022, the Company reclassified $19 million in project development costs related to various US Wind projects to intangible assets. Refer to Note 23 for further details. Other additions relate to corporate software costs.