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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - EFFECTS ON EARNINGS AND COMPREHENSIVE INCOME (Details) - CAD
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income      
Amount of unrealized gains/(loss) recognized in OCI CAD 297,000,000 CAD (34,000,000) CAD (484,000,000)
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) 283,000,000 106,000,000 119,000,000
De-designation of qualifying hedges in connection with the Canadian Restructuring Plan (Note 1) 0 0 338,000,000
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) (4,000,000) 61,000,000 26,000,000
Total unrealized derivative fair value gains/(loss), net (1,242,000,000) (509,000,000) 2,373,000,000
Gain (loss) on derivative 2,000,000    
Designated as hedging instrument      
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income      
Total unrealized derivative fair value gains/(loss), net (11,000,000) 0  
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 (10,000,000)    
Gain (loss) on derivative 2,000,000    
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 38,000,000    
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) CAD (104,000,000) 2,000,000 9,000,000
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 (1,284,000,000) (935,000,000) 2,187,000,000
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 (800,000,000) 497,000,000 1,383,000,000
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 (484,000,000) 438,000,000 804,000,000
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 (5,000,000) (19,000,000) 77,000,000
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 284,000,000 22,000,000 (248,000,000)
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) 388,000,000 145,000,000 128,000,000
De-designation of qualifying hedges in connection with the Canadian Restructuring Plan (Note 1) 0 0 338,000,000
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) (4,000,000) 61,000,000 21,000,000
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 (157,000,000) (73,000,000) 363,000,000
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 6,000,000 (90,000,000) (275,000,000)
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) (9,000,000) (12,000,000) (46,000,000)
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) 0 0 5,000,000
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 199,000,000 508,000,000 (199,000,000)
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 104,000,000 (52,000,000) (328,000,000)
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 90,000,000 474,000,000 (226,000,000)
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 (223,000,000) (38,000,000) (99,000,000)
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 38,000,000 20,000,000 2,000,000
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 11,000,000 14,000,000 9,000,000
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) 8,000,000 (29,000,000) 28,000,000
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 0 (9,000,000) 22,000,000
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 1,000,000 CAD 39,000,000 CAD (47,000,000)
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) CAD 296,000,000