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Stock Compensation Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock based Compensation Plans
Stock-based compensation plans expense	$ 7	$ (6)	$ 24	$ 8
Income tax benefit	(2)	2	(8)	(3)
Total stock-based compensation plans expense	$ 5	$ (4)	$ 16	$ 5

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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