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Fair Value Measurements (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended 1 Months Ended
Apr. 27, 2011
Apr. 30, 2011
Jan. 29, 2011
Oct. 27, 2010
May 01, 2010
Dec. 31, 2010
Interest Rate Risk [Member]
Interest rate swap expiration term           10
Senior debt, carrying value   $ 1,600,000,000 $ 1,900,000,000   $ 1,900,000,000  
Senior debt, fair value   1,800,000,000        
Repayments of long-term debt 300,000,000          
Future repayments of long-term debt       100,000,000    
Long-term investments, par value   297,000,000        
Long-term investments   250,000,000 277,000,000   318,000,000  
Long-term debt, due date Oct. 01, 2011
Debt issued           $ 400,000,000
Investment maturity year range start   2015        
Investment maturity year range end   2056        
Investment weighted-average maturity date   2035