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Financial Risk Management - Liquidity Risk - Regulated Utilities (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
Short-term borrowings |  | 1,155,000,000 | 511,000,000
Credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Short-term borrowings |  | 1,155,000,000 | CAD 511,000,000
REGULATED |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 3,823,000,000 |
REGULATED | Credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Short-term borrowings |  | 640,000,000 |
REGULATED | ITC | Revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ | $ 1,000,000,000.0 |  |
REGULATED | ITC | Commercial paper |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ | 400,000,000 |  |
REGULATED | ITC | Credit facility | Commercial paper |  |  |
Line of Credit Facility [Line Items] |  |  |
Short-term borrowings | 145,000,000 | 195,000,000 |
REGULATED | UNS Energy | Revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ | 350,000,000 |  |
REGULATED | UNS Energy | Revolving credit facility | Unsecured Committed Revolving Credit Facility Maturing October 2021 |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ | 305,000,000 |  |
REGULATED | UNS Energy | Revolving credit facility | Unsecured Committed Revolving Credit Facility Maturing October 2020 |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ | 45,000,000 |  |
REGULATED | Central Hudson | Revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ | 200,000,000 |  |
REGULATED | Central Hudson | Uncommitted credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ | 25,000,000 |  |
REGULATED | FortisBC Energy | Revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 700,000,000 |
REGULATED | FortisAlberta | Revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 250,000,000 |
REGULATED | FortisAlberta | Bilateral credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 90,000,000 |
REGULATED | FortisBC Electric | Revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 150,000,000 |
REGULATED | FortisBC Electric | Demand overdraft |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 10,000,000 |
REGULATED | Maritime Electric | Revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 50,000,000 |
REGULATED | Newfoundland Power Inc. | Revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 100,000,000 |
REGULATED | Newfoundland Power Inc. | Demand credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 20,000,000 |
REGULATED | FortisOntario | Revolving credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | CAD 30,000,000 |
REGULATED | Caribbean Utilities | Unsecured credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ | 49,000,000 |  |
REGULATED | Fortis Turks and Caicos | Demand credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ | $ 31,000,000 |  |

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