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Financial Risk Management - Liquidity Risk - Corporate and Other (Details)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2015
CAD
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   CAD 5,976,000,000 CAD 3,565,000,000
Corporate and Other      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   2,153,000,000  
Corporate and Other | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   1,300,000,000.0  
Corporate and Other | Bridge loan      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   500,000,000  
Corporate and Other | UNS Energy Corporation | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ $ 150,000,000    
Corporate and Other | UNS Energy Corporation | Unsecured Committed Revolving Credit Facility Maturing October 2021 | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ 130,000,000    
Corporate and Other | UNS Energy Corporation | Unsecured Committed Revolving Credit Facility Maturing October 2020 | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ 20,000,000    
Corporate and Other | CH Energy Group | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ $ 50,000,000    
Corporate and Other | FHI | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   CAD 50,000,000