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Stock-Based Compensation (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation Expense Recorded [Line Items]
Compensation expense	$ 83	$ 66	$ 52
Performance Share Awards [Member]
Compensation Expense Recorded [Line Items]
Compensation expense	71	53	36
Cash settlements (1)	4	3	3
Stock settlements (1)	$ 41	$ 25	$ 23

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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