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Financial Risk Management - Market Risk (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) CAD / shares CAD / $ | Oct. 14, 2016 CAD / $ | Oct. 13, 2016 CAD / $ | Dec. 31, 2015 USD ($) CAD / $
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Foreign exchange rate (CAD per USD) | CAD / $ | 1.34 | 1.32 | 1.32 | 1.38
Estimated effect of 5% change in exchange rate on EPS | CAD / shares | CAD 0.07 |  |  |
Foreign net investments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount remaining to be hedged | CAD 7,250 |  |  | $ 3,137
Designated as hedging instrument | Foreign net investments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Amount of Hedged Item | CAD 3,511 |  |  | $ 1,535

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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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