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FINANCIAL INSTRUMENTS (Details 2) (Interest rate swaps and options, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Interest rate swaps and options
       
Derivative financial instruments        
Interest expense on the interest rate swaps and options    $ 4    $ 11