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Stock Compensation Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011
Stock based Compensation Plans
Stock-based compensation plans expense	$ 40	$ 22
Income tax benefit	(14)	(8)
Total stock-based compensation plans expense, after-tax	26	14
Stock Compensation Plans (Textual) [Abstract]
Total compensation cost related to non-vested awards not yet recognized	$ 127
Weighted average period of compensation cost recognized (in years)	2.3

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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