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Regulatory Assets and Liabilities (Regulated Liabilities) (Details) - CAD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	$ 226	$ 362
Regulatory Liability, Noncurrent	2,242	1,277
Regulatory Liabilities, Total	2,468	1,639
Deferred income tax regulatory assets [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	1,116	26
Accumulated reserve - cost of removal [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	894	990
Deferrals related to derivative instruments [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	182	230
Fuel Adjustment Mechanism Liability [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	177	94
Cost Recovery Clauses Liability [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	51	153
Self Insurance Fund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	28	30
Bill Reduction Credit [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	4	10
Storm Reserve [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	0	75
Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	$ 16	$ 31

X

- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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- Definition

The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ 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 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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