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Share-Based Compensation (Total Share-Based Compensation Expense Resulting From Equity Awards) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share-Based Compensation [Abstract]
Share-based compensation expense before income taxes	$ 10	$ 8	$ 26	$ 25
Income tax benefit	(4)	(3)	(10)	(10)
Share-based compensation expense after income taxes	$ 6	$ 5	$ 16	$ 15

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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