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CHANGE IN WORKING CAPITAL (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CHANGE IN WORKING CAPITAL    
Decrease in accounts receivable and other $ 1  
Increase/(decrease) in accounts payable and accrued liabilities 1 (2)
Increase in accrued interest 5 1
Decrease/(increase) in operating working capital $ 7 $ (1)