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Capital Lease and Finance Obligations - FortisBC Electric (Details) - FortisBC Electric - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Brilliant Plant
Capital Leased Assets [Line Items]
Concentration purchased output percentage	94.00%
Capital lease costs recognized in energy supply costs and operating expenses	CAD 27	CAD 26
BTS
Capital Leased Assets [Line Items]
Capital lease costs recognized in energy supply costs and operating expenses	CAD 3	CAD 3
Capital Leases | Brilliant Plant
Capital Leased Assets [Line Items]
Stated interest rate (percent)	5.00%
Capital Leases | BTS
Capital Leased Assets [Line Items]
Stated interest rate (percent)	9.00%

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Capital Leases, Income Statement, Amortization and Interest Expense

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Concentration Purchased Output, Percentage

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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