XML 34 R62.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Value Measurements (Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Subordinated convertible debentures $ 55 $ 124
Senior and senior subordinated notes 1,861 1,854
Capital leases 39 25
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Subordinated convertible debentures 49 92
Senior and senior subordinated notes 1,933 2,020
Capital leases $ 33 [1] $ 20 [1]
[1] The fair value of capital leases is determined using the expected present value of the leases.