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Fair Value Measurements and Financial Instruments - Fair Value Hierarchy (Details) - CAD CAD in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Available-for-sale investment (Note 9 and 28) | CAD 0 | CAD 33
Recurring |  |
Assets |  |
Total gross assets | 102 | 63
Less: Counterparty netting not offset on the balance sheet | (9) | (6)
Total net assets | 93 | 57
Liabilities |  |
Total gross liabilities | 38 | 83
Less: Counterparty netting not offset on the balance sheet | (9) | (6)
Total net liabilities | 29 | 77
Recurring | Not designated as hedging instrument | Energy contracts subject to regulatory deferral |  |
Assets |  |
Derivative asset | 19 | 7
Liabilities |  |
Derivative liability | 26 | 78
Recurring | Level 1 |  |
Assets |  |
Available-for-sale investment (Note 9 and 28) | 0 | 33
Other investments | 69 | 12
Recurring | Level 1 | Not designated as hedging instrument | Energy contracts subject to regulatory deferral |  |
Assets |  |
Derivative asset | 1 |
Liabilities |  |
Derivative liability |  | 1
Recurring | Level 2 |  |
Assets |  |
Assets held for sale | 0 | 9
Recurring | Level 2 | Not designated as hedging instrument | Energy contracts subject to regulatory deferral |  |
Assets |  |
Derivative asset | 13 | 2
Liabilities |  |
Derivative liability | 21 | 52
Recurring | Level 2 | Not designated as hedging instrument | Energy contracts not subject to regulatory deferral |  |
Liabilities |  |
Derivative liability | 9 | 0
Recurring | Level 2 | Designated as hedging instrument | Interest rate swaps |  |
Assets |  |
Derivative asset | 11 | 0
Liabilities |  |
Derivative liability | 3 | 5
Recurring | Level 3 | Not designated as hedging instrument | Energy contracts subject to regulatory deferral |  |
Assets |  |
Derivative asset | 5 | 5
Liabilities |  |
Derivative liability | 5 | 25
Recurring | Level 3 | Not designated as hedging instrument | Energy contracts not subject to regulatory deferral |  |
Assets |  |
Derivative asset | CAD 3 | CAD 2

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 + Details
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