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Derivative Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Jun. 30, 2011 6.5% Convertible Senior Notes due in 2016	Dec. 31, 2010 6.5% Convertible Senior Notes due in 2016	Sep. 30, 2010 6.5% Convertible Senior Notes due in 2016	Jun. 30, 2011 Convertible Senior Discount Notes due 2013 (9.0%)	Jun. 30, 2011 Convertible Senior Notes due 2011 (5.25%)
Long-term debt
Principal amount of notes							$ 26	$ 175
Interest rate of convertible senior notes (as a percent)						6.50%			9.00%	5.25%
Fair value, Derivatives designated as hedging instruments
Cash flow hedging contracts	100		100		108
Amount of gains (losses) recognized in Other Comprehensive Loss, Derivatives designated as hedging instruments
Cash flow hedging contracts	(2)	(13)	8	(21)
Amount of gains (losses) reclassified from AOCI to Income/Loss (effective portions), Derivatives designated as hedging instruments
Cash flow hedging contracts - Interest Expense	(12)	(11)	(23)	(23)
Net losses on the interest rate swaps that will be reclassified into earnings during the next twelve months	46		46
Effect of the derivatives not designated as hedging instruments on net loss
Embedded equity conversion rights located in Other Income (Expense) - Other, net		$ 8		$ 10