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Stock Based Compensation (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
Stock Based Compensation (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 13	$ 9	$ 42	$ 38
Tax benefit	5	4	16	15
Stock-based compensation cost capitalized in property, plant and equipment	$ 1.0	$ 1.0	$ 3.0	$ 2.0

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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