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Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2020
Disclosure of analysis of other comprehensive income by item [abstract]  
Accumulated other comprehensive income Accumulated Other Comprehensive Income
The components of, and changes in, accumulated other comprehensive income (loss) are as follows:
 20202019
Currency translation adjustment  
Opening balance, Jan. 1(21)17 
Gains (losses) on translating net assets of foreign operations, net of reclassifications to net earnings,
net of tax		(11)(59)
Gains (losses) on financial instruments designated as hedges of foreign operations, net of
reclassifications to net earnings, net of tax		11 21 
Balance, Dec. 31(21)(21)
Cash flow hedges  
Opening balance, Jan. 1527 508 
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and
   to non-financial assets, net of tax(1)
(91)19 
Balance, Dec. 31436 527 
Employee future benefits  
Opening balance, Jan. 1(55)(29)
Net actuarial gains (losses) on defined benefit plans, net of tax(2)
(11)(26)
Balance, Dec. 31(66)(55)
Other  
Opening balance, Jan. 13 (15)
Change in ownership of TransAlta Renewables— 1 
Intercompany investments at FVOCI(50)17 
Balance, Dec. 31(47)3 
Accumulated other comprehensive income302 454 
(1) Net of income tax of $23 million for the year ended Dec. 31, 2020 (2019 — $6 million).
(2) Net of income tax of $3 million for the year ended Dec. 31, 2020 (2019 — $7 million).