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Long Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total $ 1,599 $ 859
Less: current maturities 32 56
Total long-term debt 1,567 803
Senior Notes Due February 2019 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 6.50%  
Total 400 400
Senior Notes Due February 2021 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 6.75%  
Total 350 350
Senior Notes Due September 2021 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 5.375%  
Total 450  
Senior Notes Due September 2023 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 6.00%  
Total 300  
Other Indebtedness
   
Debt Instrument [Line Items]    
Total $ 99 $ 109