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Financial Risk Management - Liquidity Risk (Details) CAD in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2015 CAD
Line of Credit Facility [Line Items] |  |  |
Short-term borrowings |  | CAD 1,155 | CAD 511
Maximum borrowing capacity |  | 5,976 | 3,565
Credit facilities unused |  |  | 2,399
Credit facility | Bank concentration risk |  |  |
Line of Credit Facility [Line Items] |  |  |
Concentration risk percentage | 20.00% |  |
Line of Credit Facilities Maturing 2017 through 2021 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 5,100 |
Committed revolving corporate credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facilities unused |  | 3,729 |
Fixed-term debt |  |  |
Line of Credit Facility [Line Items] |  |  |
Principal repayments in the next five years |  | 680 |
Credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Short-term borrowings |  | 1,155 | CAD 511
Corporate | Committed revolving corporate credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facilities unused |  | 915 |
REGULATED |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 3,823 |
Credit facilities unused |  | 2,607 |
REGULATED | Credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Short-term borrowings |  | 640 |
REGULATED | ITC | Committed revolving corporate 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 | CAD 195 |

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