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Financial Risk Management - Schedule of Credit Facilities (Details) CAD in Millions, $ in Millions | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2015 CAD
--- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |
Total credit facilities |  | CAD 5,976 | CAD 3,565
Credit facilities utilized: |  |  |
Short-term borrowings |  | (1,155) | (511)
Long-term debt (Note 14) |  | (21,219) | (11,244)
Letters of credit outstanding |  | (119) | (104)
Credit facilities unused |  |  | 2,399
Current installments of long-term debt |  | 251 | 384
Credit facility |  |  |
Credit facilities utilized: |  |  |
Short-term borrowings |  | CAD (1,155) | CAD (511)
Credit facility |  |  |
Credit facilities utilized: |  |  |
Short-term debt weighted average interest rate (percent) | 1.70% | 1.70% | 1.00%
Current installments of long-term debt |  | CAD 61 | CAD 71
Long-term debt weighted average interest rate (percent) | 1.80% | 1.80% | 1.50%
REGULATED |  |  |
Line of Credit Facility [Line Items] |  |  |
Total credit facilities |  | CAD 3,823 |
Credit facilities utilized: |  |  |
Letters of credit outstanding |  | (68) |
Credit facilities unused |  | 2,607 |
REGULATED | Commercial paper | ITC |  |  |
Line of Credit Facility [Line Items] |  |  |
Total credit facilities | $ | $ 400 |  |
REGULATED | Credit facility |  |  |
Credit facilities utilized: |  |  |
Short-term borrowings |  | (640) |
REGULATED | Credit facility | Commercial paper | ITC |  |  |
Credit facilities utilized: |  |  |
Short-term borrowings | $ (145) | (195) |
NON-REGULATED |  |  |
Line of Credit Facility [Line Items] |  |  |
Total credit facilities |  | 2,153 |
Credit facilities utilized: |  |  |
Letters of credit outstanding |  | (51) |
Credit facilities unused |  | 1,122 |
NON-REGULATED | Credit facility |  |  |
Credit facilities utilized: |  |  |
Short-term borrowings |  | (515) |
Long-term Credit Facility Borrowings | Credit facility |  |  |
Credit facilities utilized: |  |  |
Long-term debt (Note 14) |  | (973) | CAD (551)
Long-term Credit Facility Borrowings | REGULATED | Credit facility |  |  |
Credit facilities utilized: |  |  |
Long-term debt (Note 14) |  | (508) |
Long-term Credit Facility Borrowings | NON-REGULATED | Credit facility |  |  |
Credit facilities utilized: |  |  |
Long-term debt (Note 14) |  | CAD (465) |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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