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Financing Obligations (Notes Sold) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Jun. 02, 2011
Debt Instrument [Line Items]    
Aggregate principal amount 400  
4.750% Senior Notes due 2021 [Member]
   
Debt Instrument [Line Items]    
Aggregate principal amount   $ 400
Stated interest rate   4.75%
Issue price as percentage of principal amount   98.989%
Repurchase price as percentage of principal amount upon change of control 101.00%  
4.750% Senior Notes due 2021 [Member] | Redemption Period, Prior to March 1, 2021 [Member]
   
Debt Instrument [Line Items]    
Redemption price as percentage of principal amount 100.00%  
Description redemption discount rate basis Treasury Rate  
Basis spread on redemption discount rate 0.30%  
4.750% Senior Notes due 2021 [Member] | Redemption Period, On or After March 1, 2021 [Member]
   
Debt Instrument [Line Items]    
Redemption price as percentage of principal amount 100.00%