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Goodwill
 12 Months Ended
Dec. 31, 2020
Disclosure of detailed information about goodwill [Abstract]  
Goodwill Goodwill
Goodwill acquired through business combinations has been allocated to CGUs that are expected to benefit from the synergies of the acquisitions. Goodwill by segments are as follows:
As at Dec. 3120202019
Hydro258 258 
Wind and Solar175 176 
Energy Marketing30 30 
Total goodwill463 464 

For the purposes of the 2020 annual goodwill impairment review, the Corporation determined the recoverable amounts of the Wind and Solar segment by calculating the fair value less costs of disposal using discounted cash flow projections based on the Corporation's long-range forecasts for the period extending to the last planned asset retirement in 2073. The resulting fair value measurement is categorized within Level III of the fair value hierarchy. No impairment of goodwill arose for any segment. In 2020, the Corporation relied on the recoverable amounts determined in 2019 for the Hydro and Energy Marketing segments in performing the 2020 annual goodwill impairment review. No impairment of goodwill arose for any segment.

The key assumptions impacting the determination of fair value for the Wind and Solar and Hydro segments are electricity production and sales prices. Forecasts of electricity production for each facility are determined taking into consideration contracts for the sale of electricity, historical production, regional supply-demand balances and capital maintenance and expansion plans. Forecasted sales prices for each facility are determined by taking into consideration contract prices for facilities subject to long- or short-term contracts, forward price curves for merchant plants and regional supply-demand balances. Where forward price curves are not available for the duration of the facility’s useful life, prices are determined by extrapolation techniques using historical industry and company-specific data. Electricity prices used in these 2020 models ranged between $6 to $160 per MWh during the forecast period (2019 – $5 to $183 per MWh). Discount rates used for the goodwill impairment calculation in 2020 ranged from 4.8 per cent to 6.3 per cent (2019 – 3.6 per cent to 7.0 per cent). No reasonable possible change in the assumptions would have resulted in an impairment of goodwill.