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Stock-Based Compensation (Details 4) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Award Activity [Line Items]
Restricted common shares awarded	621,114
Compensation cost charged against income (in millions)	$ 66	$ 52	$ 56
Restricted Stock [Member]
Stock Award Activity [Line Items]
Fair value of awards vested (in millions)	13	19	18
Restricted common shares awarded	381,840	238,405	523,660
Weighted average market price of shares awarded	$ 47.98	$ 44.08	$ 28.73
Compensation cost charged against income (in millions)	$ 12	$ 12	$ 18

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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