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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - EFFECTS OF DERIVATIVE INSTRUMENTS ON STATEMENT OF EARNINGS AND COMPREHENSIVE INCOME (Details) - CAD
CAD in Millions
12 Months Ended
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 (484) CAD (1,128)
Amount of gains/(loss) reclassified from AOCI to earnings (effective portion) 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) 26 210
Total unrealized derivative fair value gains/(loss) CAD (2,373) 96
Rolling time period over which the Company forecasts cash requirements 12 months  
Period of anticipated requirements for which the Company maintains sufficient liquidity through committed credit facilities 1 year  
Non-Qualifying Derivative Instruments    
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income    
Total unrealized derivative fair value gains/(loss) CAD (2,373) 106
Cash Flow Hedges.    
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income    
Estimated amount of AOCI related to cash flow hedges reclassified to earnings in the next 12 months CAD 71  
Period to hedge exposures to the variability of cash flows for all forecasted transactions 48 months  
Foreign Exchange Risk | 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 9 8
Foreign Exchange Risk | Non-Qualifying Derivative Instruments    
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income    
Total unrealized derivative fair value gains/(loss) (2,187) (936)
Foreign Exchange Risk | 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) (1,383) (496)
Foreign Exchange Risk | 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) (804) (440)
Foreign Exchange Risk | Cash Flow Hedges.    
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income    
Amount of unrealized gains/(loss) recognized in OCI 77 8
Foreign Exchange Risk | Net Investment Hedges    
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income    
Amount of unrealized gains/(loss) recognized in OCI (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) 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) 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) (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 (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) (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) 199 1,031
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) (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) 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) (2) (13)
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) 328 741
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 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) 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) (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 (47) CAD 13