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Share-based Compensation Plans: Performance Plan Share Units (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award Payout, Shares of Common Stock Percentage 100.00%    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award Payout, Shares of Common Stock Percentage 50.00%    
Performance Share Award, Percentage of Target 40.17%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years    
Award vesting period 3 years    
Performance Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award, Percentage of Target 0.00% 0.00% 0.00%
Performance Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award, Percentage of Target 200.00% 200.00% 200.00%