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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 |

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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 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. + Details
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- 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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- 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 + Details
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