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CONTINGENCIES (Details)
In Millions, unless otherwise specified
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2014
EEP
Jun. 30, 2014
Line 6B Crude Oil Release
USD ($)
Jun. 30, 2014
Line 6B Crude Oil Release
CAD
Jun. 30, 2014
Line 6B Crude Oil Release
USD ($)
Jun. 30, 2014
Line 6B Crude Oil Release
CAD
Mar. 31, 2013
Line 6B Crude Oil Release
item
Jun. 30, 2014
Line 6B Crude Oil Release
EEP
USD ($)
item
Apr. 30, 2011
Line 6B Crude Oil Release
EEP
USD ($)
COMMITMENTS AND CONTINGENCIES                  
Ownership interest (as a percent)   20.50%              
Estimated cost     $ 1,157   $ 1,157        
Estimated cost, net of tax       186   186      
Estimated increase in cost     35   35        
Estimated increase in cost, net of tax       5   5      
Estimated fine or penalty amount               30  
Increase in estimated cost               30  
Aggregate limited amount for pollution liability under insurance program 700               650
Amount of to date insurance claim recorded     547   547        
Amount of to date insurance claim recorded, net of tax       80   80      
Expected insurance recovery               650  
Number of actions or claims filed             1 17  
Increased amount of deductible applicable to oil pollution events (per event) 30                
Previous amount of deductible applicable to oil pollution events (per event) $ 10