Equity Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Equity Based Compensation Table [Abstract]

Schedule of Equity Based Compensation Expense

Equity-based compensation expense recognized for the three and six months endedJune 30,2011 and 2010 is as follows (in millions):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
Restricted stock units	$	16	$	15	$	42	$	34
Stock options		8		10		23		27
Total equity-based compensation expense	$	24	$	25	$	65	$	61

Schedule of Stock Options Valuation Assumptions

The table below presents the assumptions used to value stock options at their grant date for the six months endedJune 30,2011 and 2010 and reflects the weighted average of all awards granted within each period:

	Six Months Ended
	June 30,
	2011		2010
Expected volatility		31.21%		31.39%
Expected term to exercise from grant date (in years)		6.41		6.73
Risk-free rate		2.82%		3.06%
Expected dividend yield		2.66%		3.54%