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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - EFFECTS ON EARNINGS AND COMPREHENSIVE INCOME (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gains/(loss) recognized in OCI | CAD (34) | CAD (484) | CAD (1,128)
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) | 106 | 119 | 106
De-designation of qualifying hedges in connection with the Canadian Restructuring Plan (Note 1) |  | 338 |
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) | 61 | 26 | 210
Total unrealized derivative fair value gains/(loss), net | 509 | (2,373) | 96
Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | 509 | (2,373) | 106
Cash Flow Hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Estimated gain of AOCI related to cash flow hedges reclassified to earnings in the next 12 months | CAD 23 |  |
Period to hedge exposures to the variability of cash flows for all forecasted transactions | 36 months |  |
Foreign exchange contracts | Other income/(expense) |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) | CAD 2 | 9 | 8
Foreign exchange contracts | Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | 935 | (2,187) | (936)
Foreign exchange contracts | Non-Qualifying Derivative Instruments | Transportation and other services revenues |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | 497 | (1,383) | (496)
Foreign exchange contracts | Non-Qualifying Derivative Instruments | Other income/(expense) |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | 438 | (804) | (440)
Foreign exchange contracts | Cash Flow Hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gains/(loss) recognized in OCI | (19) | 77 | 8
Foreign exchange contracts | Net Investment Hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gains/(loss) recognized in OCI | 22 | (248) | (113)
Interest rate contracts | Interest expense |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) | 145 | 128 | 101
De-designation of qualifying hedges in connection with the Canadian Restructuring Plan (Note 1) |  | 338 |
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) | 61 | 21 | 216
Interest rate contracts | Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | 73 | (363) | 4
Interest rate contracts | Cash Flow Hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gains/(loss) recognized in OCI | (90) | (275) | (1,086)
Commodity contracts | Commodity costs |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) | (12) | (46) | 4
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) |  | 5 | (6)
Commodity contracts | Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | (508) | 199 | 1,031
Commodity contracts | Non-Qualifying Derivative Instruments | Transportation and other services revenues |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | (52) | 328 | 741
Commodity contracts | Non-Qualifying Derivative Instruments | Commodity sales |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | (474) | (226) | 0
Commodity contracts | Non-Qualifying Derivative Instruments | Commodity costs |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | 38 | 99 | 303
Commodity contracts | Non-Qualifying Derivative Instruments | Operating and administrative expense |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | (20) | (2) | (13)
Commodity contracts | Cash Flow Hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gains/(loss) recognized in OCI | 14 | 9 | 50
Other contracts | Operating and administrative expense |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) | (29) | 28 | (7)
Other contracts | Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Total unrealized derivative fair value gains/(loss), net | 9 | (22) | 7
Other contracts | Cash Flow Hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gains/(loss) recognized in OCI | CAD 39 | CAD (47) | CAD 13

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- Definition The dedesignation of qualifying hedges reclassified from accumulated other comprehensive income into income on derivative instruments qualifying as hedging instruments. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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