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Debt (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Debt    
Other $ 9 $ 9
Total debt 510 510
Less current portion 351 351
Long-term debt 159 159
5.65% interest payable semi annually on Senior Notes due on November 15, 2012 [Member]
   
Debt    
Senior Notes 200 200
5.5% interest payable semi annually on Senior Notes due on November 19, 2012 [Member]
   
Debt    
Senior Notes 150 150
6.125% interest payable semi annually on Senior Notes due on August 15, 2015 [Member]
   
Debt    
Senior Notes $ 151 $ 151