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CHANGE IN WORKING CAPITAL (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
CHANGE IN WORKING CAPITAL    
Increase/(decrease) in accounts payable and accrued liabilities $ 2 $ (1)
Increase in accrued interest 5 5
Decrease in operating working capital $ 7 $ 4