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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