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Long-Term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Aug. 04, 2011
Apr. 12, 2010
Dec. 31, 2011
Dec. 31, 2010
Aug. 04, 2011
2016 Notes [Member]
Jun. 23, 2009
2019 Notes [Member]
Apr. 12, 2010
2020 Notes [Member]
Apr. 12, 2010
2040 Notes [Member]
Aug. 04, 2011
2041 Notes [Member]
Debt Instrument [Line Items]                  
Issuance of unsecured senior notes $ 750 $ 1,000     $ 500 $ 750 $ 750 $ 250 $ 250
Unsecured senior debt stated interest rate in %         3.50% 8.125% 6.875% 8.125% 7.00%
Minimum incremental increase in interest rate on the notes           0.25%      
Maximum incremental increase in interest rate on the notes           2.00%      
Long-Term Debt (Textual) [Abstract]                  
Offer to repurchase the notes upon control triggering event     101.00%            
Number of days ceased to be rated investment grade for becoming change of control triggering event     60 days            
Carrying value of the notes     2,595 1,769          
Estimated fair value of the notes     $ 2,801 $ 1,865