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Long-Term Debt - Schedule of Long-Term Debt (Details) - CAD CAD in Millions | Dec. 31, 2016 | Oct. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long-term debt | CAD 21,219 |  | CAD 11,244
Less: Deferred financing costs and debt discounts | (151) |  | (76)
Less: Current installments of long-term debt | (251) |  | (384)
Long-term debt | CAD 20,817 |  | CAD 10,784
Credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 1.80% |  | 1.50%
Less: Current installments of long-term debt | CAD (61) |  | CAD (71)
Credit facility | Long-term Credit Facility Borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | 973 |  | 551
REGULATED | Credit facility | Long-term Credit Facility Borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | CAD 508 |  |
REGULATED | ITC | Secured | Fixed Rate Secured US First Mortgage Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 4.81% |  |
Total long-term debt | CAD 1,994 |  | 0
REGULATED | ITC | Secured | Fixed Rate Secured US Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 4.19% |  |
Total long-term debt | CAD 638 |  | 0
REGULATED | ITC | Unsecured | Fixed Rate Unsecured US Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 4.80% |  |
Total long-term debt | CAD 3,160 |  | 0
REGULATED | ITC | Unsecured | 6.00% Unsecured US Shareholder Note |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (percent) | 6.00% | 6.00% |
Total long-term debt | CAD 267 |  | CAD 0
REGULATED | UNS Energy | Unsecured | Fixed and Variable Rate Unsecured US Tax-Exempt Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 3.87% |  | 3.83%
Total long-term debt | CAD 827 |  | CAD 852
REGULATED | UNS Energy | Unsecured | Fixed Rate Unsecured US Notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 4.26% |  | 4.26%
Total long-term debt | CAD 1,511 |  | CAD 1,557
REGULATED | Central Hudson | Unsecured | Fixed and Variable Rate Unsecured US Promissory Notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 4.25% |  | 4.30%
Total long-term debt | CAD 768 |  | CAD 728
REGULATED | FortisBC Energy | Secured | Fixed Rate Secured Purchase Money Mortgages |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 10.30% |  | 10.30%
Total long-term debt | CAD 0 |  | CAD 200
REGULATED | FortisBC Energy | Unsecured | Fixed Rate Unsecured Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 5.24% |  | 5.73%
Total long-term debt | CAD 2,220 |  | CAD 1,770
REGULATED | FortisBC Energy | Loan | Government Loan |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | CAD 0 |  | CAD 5
REGULATED | FortisAlberta | Unsecured | Fixed Rate Unsecured Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 4.82% |  | 4.95%
Total long-term debt | CAD 1,834 |  | CAD 1,684
REGULATED | FortisBC Electric | Secured | Fixed Rate Secured Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (percent) | 8.80% |  | 8.80%
Total long-term debt | CAD 25 |  | CAD 25
REGULATED | FortisBC Electric | Unsecured | Fixed Rate Unsecured Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 5.22% |  | 5.36%
Total long-term debt | CAD 635 |  | CAD 660
REGULATED | Eastern Canadian | Secured | Fixed Rate Secured First Mortgage Sinking Fund Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 6.48% |  | 6.72%
Total long-term debt | CAD 516 |  | CAD 553
REGULATED | Eastern Canadian | Secured | Fixed Rate Secured First Mortgage Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 6.19% |  | 7.18%
Total long-term debt | CAD 195 |  | CAD 167
REGULATED | Eastern Canadian | Unsecured | Fixed Rate Unsecured Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 6.11% |  | 6.11%
Total long-term debt | CAD 104 |  | CAD 104
REGULATED | Caribbean Electric | Unsecured | Fixed and Variable Rate Unsecured US Senior Loan Notes and Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 4.92% |  | 4.89%
Total long-term debt | CAD 499 |  | CAD 467
NON-REGULATED | Credit facility | Long-term Credit Facility Borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | CAD 465 |  |
NON-REGULATED | Corporate | Unsecured | Fixed Rate Unsecured Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 6.50% |  | 6.49%
Total long-term debt | CAD 200 |  | CAD 201
NON-REGULATED | Corporate | Unsecured | Fixed Rate Unsecured US Senior Notes and Promissory Notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average rate (percent) | 3.43% |  | 4.43%
Total long-term debt | CAD 4,353 |  | CAD 1,720
NON-REGULATED | Corporate | Unsecured | Fixed Rate 2.85% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (percent) | 2.85% |  |
Total long-term debt | CAD 500 |  | CAD 0

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