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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS (Details 4) (CAD)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gains/(loss) recognized in OCI 712 (310) 785 (117)
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) 26 4 39 20
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) (16) 1 21 (1)
Total unrealized derivative fair value gains/(loss) (358) (330) (606) (531)
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) (354) (309) (598) (499)
Derivative Instruments used as 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     63  
Period to hedge exposures to the variability of cash flows for all forecasted transactions     54 months  
Foreign exchange contracts | Other income
       
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) (1) (3) (1)
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) (508) (76) (701) (61)
Foreign exchange contracts | Derivative Instruments used as Cash Flow Hedges
       
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gains/(loss) recognized in OCI 33 (10) 47 9
Foreign exchange contracts | Derivative Instruments used as Net Investment Hedges
       
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gains/(loss) recognized in OCI (45) (21) (67) (18)
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) 33 10 46 24
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) (15) 4 23 4
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) (1) 1 (5) (1)
Interest rate contracts | Derivative Instruments used as Cash Flow Hedges
       
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gains/(loss) recognized in OCI 710 (369) 789 (189)
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) (4) (5) (4) (3)
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) (1) (3) (2) (5)
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) 157 (239) 104 (442)
Commodity contracts | Derivative Instruments used as Cash Flow Hedges
       
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income        
Amount of unrealized gains/(loss) recognized in OCI 17 89 17 81
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) (2) 5 4 5
Other contracts | Derivative Instruments used as 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 (1)