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COMMITMENTS AND CONTINGENCIES (Details)
In Millions, unless otherwise specified
 8 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CAD
Dec. 31, 2011
CAD
Dec. 31, 2010
CAD
Dec. 31, 2012
EEP
USD ($)
item
Dec. 31, 2012
EEP
CAD
Dec. 31, 2011
EEP
USD ($)
Dec. 31, 2011
EEP
CAD
Dec. 31, 2012
Environmental Liabilities
CAD
Dec. 31, 2011
Environmental Liabilities
CAD
Aug. 07, 2012
Lakehead System Line 14 Crude Oil Release
EEP
Jul. 27, 2012
Lakehead System Line 14 Crude Oil Release
EEP
bbl
Dec. 31, 2012
Lakehead System Line 14 Crude Oil Release
EEP
USD ($)
Dec. 31, 2012
Lakehead System Line 14 Crude Oil Release
EEP
CAD
Dec. 31, 2012
Line 6B Crude Oil Release
USD ($)
Dec. 31, 2012
Line 6B Crude Oil Release
CAD
Apr. 30, 2011
Line 6B Crude Oil Release
EEP
USD ($)
Jul. 26, 2010
Line 6B Crude Oil Release
EEP
mi
bbl
Jul. 26, 2010
Line 6B Crude Oil Release
EEP
km
Sep. 30, 2012
Line 6B Crude Oil Release
EEP
USD ($)
Dec. 31, 2012
Line 6B Crude Oil Release
EEP
USD ($)
item
Dec. 31, 2012
Line 6A Crude Oil Release
CAD
Sep. 09, 2010
Line 6A Crude Oil Release
EEP
bbl
Dec. 31, 2012
Line 6A Crude Oil Release
EEP
USD ($)
item
Amount expected to be paid within the next five years for contracts for the purchase of services, pipe and other materials, as well as transportation                                                
Total amount expected to be paid for contracts for the purchase of services, pipe and other materials, as well as transportation   4,668                                            
Thereafter   1,023                                            
Minimum future payments under operating leases                                                
Aggregated minimum future payments under operating leases   329                                            
Estimated annual lease payments for 2013   40                                            
Estimated annual lease payments for 2014   41                                            
Estimated annual lease payments for 2015   39                                            
Estimated annual lease payments for 2016   38                                            
Estimated annual lease payments for 2017   34                                            
Thereafter   137                                            
Total rental expense for operating leases   31 28 23                                        
COMMITMENTS AND CONTINGENCIES                                                
Ownership interest (as a percent)         21.80% 21.80%                                    
Environmental liabilities included in current liabilities   107 175           107 175                            
Environmental liabilities included in other long term liabilities                 18 32                            
Estimated volume of oil released (in barrels)                       1,700           20,000 20,000       9,000  
Percentage of pressure prior to the incident up to which operating pressure was restricted by PHMSA                     80.00%                          
Area affected by released crude oil                                   38 61          
Estimated volume of oil removed from the pipeline as part of the repair (in barrels)                                             1,400  
Estimated cost                         10               820     48
Estimated cost, net of tax                           1   137           7    
Lost revenue                         2                      
Civil penalty                                       3.7        
Increase in estimated cost                                         55      
Increase in estimated cost, net of tax                               8                
Number of subsidiaries with which an insurance allocation agreement has been entered         1 1                                    
Aggregate limited amount for pollution liability under insurance program 660                               650              
Amount of insurance claim recognized         170   335               505                  
Amount of insurance claim recognized, net of tax           24   50               74                
Expected insurance recovery                                         $ 145      
Number of actions or claims filed                                         30     1