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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Employee Severance [Member]
Subsequent Event [Line Items]
Number of employees worldwide	6,110
Employee Severance [Member] \| Restructuring Charges [Member]
Subsequent Event [Line Items]
Estimated restructuring charges attributable to termination benefits	$ 20
Planned percent reduction in workforce	3.00%

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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