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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
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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 |

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