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Fair Value Measurements and Financial Instruments - Financial Instruments Not Carried At Fair Value (Details) - CAD CAD in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt (Note 14)	CAD 21,219	CAD 11,244
Credit facility | Long-term Credit Facility Borrowings
Debt Instrument [Line Items]
Long-term debt (Note 14)	973	551
Credit facility | Level 1 | Long-term Credit Facility Borrowings
Debt Instrument [Line Items]
Long-term debt (Note 14)	973	551
Carrying Value
Debt Instrument [Line Items]
Long-term debt, including current portion (Note 14)	21,219	11,244
Carrying Value | Waneta Partnership
Debt Instrument [Line Items]
Waneta Partnership promissory note (Note 16)	59	56
Estimated Fair Value
Debt Instrument [Line Items]
Long-term debt, including current portion (Note 14)	22,523	12,614
Estimated Fair Value | Waneta Partnership
Debt Instrument [Line Items]
Waneta Partnership promissory note (Note 16)	61	59
NON-REGULATED | Credit facility | Long-term Credit Facility Borrowings
Debt Instrument [Line Items]
Long-term debt (Note 14)	465
NON-REGULATED | Corporate | Unsecured | Unsecured Debentures
Debt Instrument [Line Items]
Long-term debt (Note 14)	200	201
NON-REGULATED | Corporate | Unsecured | 2.85% Senior Notes
Debt Instrument [Line Items]
Long-term debt (Note 14)	500	CAD 0
NON-REGULATED | Corporate | Unsecured | Level 1 | Unsecured Debentures
Debt Instrument [Line Items]
Long-term debt (Note 14)	200
NON-REGULATED | Corporate | Unsecured | Level 1 | 2.85% Senior Notes
Debt Instrument [Line Items]
Long-term debt (Note 14)	CAD 500

X

- 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

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- Definition

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+ References

No definition available.

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X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of notes payable.

+ 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 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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