XML 28 R124.htm IDEA: XBRL DOCUMENT

Share-Based Compensation (Summary of Components of Share-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Total share-based compensation expense	$ 37	$ 32	$ 32
Related tax benefits recognized in net income	$ 14	$ 12	$ 12

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.

+ References+ Details