Share Based Compensation (Details 1) (Employee Stock Option [Member], USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Employee Stock Option [Member]
Options Activity, Number of Options
Outstanding at January 1	4,882
Granted	761
Exercised	(503)
Canceled	(30)
Forfeited	(47)
Outstanding at December 31	5,063	4,882
Exercisable at December 31	3,511
Option Activity, Weighted Average Exercise Price
Outstanding at January 1	$ 24.81
Granted	$ 15.04
Exercised	$ 7.55
Canceled	$ 45.80
Forfeited	$ 15.35
Outstanding at December 31	$ 25.02	$ 24.81
Exercisable at December 31	$ 29.77
Options Activity, Weighted Remaining Contractual Term and Aggregate Intrisic Value
Weighted Average Remaining Contractual Term, Outstanding at January 1	6 years 2 months 4 days	6 years 8 months 19 days
Weighted Average Remaining Contractual Term, Outstanding at December 31, 2012	6 years 2 months 4 days	6 years 8 months 19 days
Weighted Average Remaining Contractual Term, Exercisable at December 31, 2012	6 years 1 month 10 days
Aggregate Intrinsic Value, Outstanding at January 1	$ 4
Aggregate Intrinsic Value, Outstanding at December 31	45	4
Aggregate Intrinsic Value, Exercisable at December 31	24
Options Activity, Vested and Expected to Vest
Number of Options, Vested and Expected to Vest at December 31	5,047
Weighted Average Exercise Price, Vested and Expected to Vest at December 31	$ 25.05
Weighted Average Remaining Contractual Term, Vested and Expected to Vest at December 31	7 years 1 month 2 days
Aggregate Intrinsic Value, Vested and Expected to Vest at December 31	$ 45

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