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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - EFFECTS ON EARNINGS AND COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gains/(loss) recognized in OCI | $ (141) | $ 297 | $ (34)
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) | 168 | 283 | 106
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) | 23 | (4) | 61
Unrealized gain/(loss) on derivative | 7 | (10) |
Unrealized gain/(loss) on hedged item | 1 | 11 |
Realized gain/(loss) on derivative | (8) | 2 |
Realized gain/(loss) on hedged item | (1) | (2) |
Total unrealized derivative fair value gains/(loss), net | (903) | 1,242 | 509
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 | $ 18 |  |
Period to hedge exposures to the variability of cash flows for all forecasted transactions | 36 months |  |
Forward currency 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) | $ 5 | (104) | 2
Forward currency 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 | (1,390) | 1,284 | 935
Forward currency 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 | (1,108) | 800 | 497
Forward currency 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 | (282) | 484 | 438
Forward currency 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 | (5) | (19)
Forward currency 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 | 31 | 284 | 22
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) | 161 | 388 | 145
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) | 23 | (4) | 61
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 | 5 | 157 | 73
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 | (190) | 6 | (90)
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) | (1) | (9) | (12)
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 | 485 | (199) | (508)
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 | 66 | (104) | (52)
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 | 599 | 90 | (474)
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 | (193) | (223) | 38
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 | 13 | 38 | (20)
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 | 2 | 11 | 14
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) | 3 | 8 | (29)
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 | (3) | 0 | 9
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 | (3) | $ 1 | $ 39
Interest Rate Swap | 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) | $ 296 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109977999&loc=d3e76258-113986 + Details
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