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Stock-Based Compensation (Details 4) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Award Activity [Line Items]
Restricted common shares awarded	590,098
Compensation cost charged against income (in millions)	$ 83	$ 66	$ 52
Restricted Stock [Member]
Stock Award Activity [Line Items]
Fair value of awards vested (in millions)	9	13	19
Restricted common shares awarded	167,320	381,840	238,405
Weighted average market price of shares awarded	$ 53.71	$ 47.98	$ 44.08
Compensation cost charged against income (in millions)	$ 12	$ 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.

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