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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Mar. 01, 2021
Apr. 14, 2020
Feb. 05, 2020
Jun. 30, 2021
Jun. 30, 2020
Payments to Acquire Businesses, Gross       $ 18 $ 6
Proceeds from Sale of Interest to Minority Shareholders         $ 7
Hydro-Québec [Member]          
Proceeds from Sale of Interest to Minority Shareholders   $ 9      
Proceeds on Loan from Counterparty Related to Sale of Interest to Minority Shareholders   $ 2      
Ashwoods [Member] | Hydro-Québec [Member]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   45.00%   45.00%  
Pi Innovo Holdings Limited [Member]          
Business Acquisition, Percentage of Voting Interests Acquired 51.00%        
Business Combination, Step Acquisition, Equity Interest in Acquiree, including Subsequent Acquisition, Percentage, Total 100.00%        
Business Combination, Consideration Transferred, Total $ 35        
Payments to Acquire Businesses, Gross 18        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value $ 17        
Curtis Investment's Interest in Ashwoods Innovations Limited [Member]          
Business Acquisition, Percentage of Voting Interests Acquired     35.40%    
Business Combination, Consideration Transferred, Total     $ 22    
Payments to Acquire Businesses, Gross     $ 8    
Ownership percentage     97.80%    
Equity Method Investments, Effective Settlement of Pre-existing Loan Payable     $ 4    
Curtis Investment's Interest in Ashwoods Innovations Limited [Member] | Other Operating Income (Expense) [Member]          
Equity Method Investment, Gain (loss) to Other Income (Expense), Net     3    
Investment in Ashwoods [Member]          
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value     $ 10