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Note 7 - Redeemable Noncontrolling Interests (Details Textual) - USD ($)
$ in Millions
Apr. 14, 2020
Jul. 29, 2019
Jun. 22, 2018
Ashwoods [Member] | Hydro-Québec [Member]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 45.00%    
Temporary Equity, Increase from Sale of Parent Equity Interest $ 7    
TM4 Inc. [Member]      
Temporary Equity, Stock Issued During Period, Value, New Issues     $ 102
TM4 Inc. [Member] | Hydro-Québec [Member]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     45.00%
S.M.E. S.p.A. [Member] | Hydro-Québec [Member]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   45.00%  
Prestolite E-Propulsion Systems (Beijing) Limited [Member] | Hydro-Québec [Member]      
Minority Interest, Ownership Percentage by Noncontrolling Owners, Increase   22.50%  
SME and PEPS [Member]      
Temporary Equity, Increase from Sale of Parent Equity Interest   $ 64