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Employee Benefit Plans (Share-Based Compensation Expense) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Employee Benefit Plans
Share-based compensation expense	$ 14	$ 8	$ 27	$ 21
Unrecognized share-based compensation expense	$ 63		$ 63		$ 43

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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