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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details 4) (CAD)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income      
Amount of unrealized gains/(loss) recognized in OCI (8) (694) (96)
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) (1) (66) (61)
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) 20 16 (3)
Total unrealized derivative fair value gains/(loss) (665) 73  
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) (649) 114 18
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 101    
Period to hedge exposures to the variability of cash flows for all forecasted transactions 60 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) 1 1 (7)
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) 120 (179) 33
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 (12) (22) (25)
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 1 (26) 19
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) (1) (10) 61
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) 23 11  
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) (2) 9 (3)
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 (46) (724) (217)
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) (3) (55) (116)
Amount of (gains)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) (3) 5 (3)
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) (765) 280 (12)
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 52 72 128
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) 2 (2) 1
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) 4  
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) 6 (1)