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Long-term Debt (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Long-term Debt, Unclassified [Abstract]  
Debt issuance date May 9, 2007
Principal amount $ 1,100
Stated interest rate 2.75%
Final maturity date May 09, 2014
Put Option Date May 09, 2012