Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Stock-Based Compensation [Abstract]

Stock option rollforward table

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Term (in years)		Aggregate Intrinsic Value (in millions)
Outstanding - December31,2010		17,164,890	$	17.44		5.6	$	8
Granted		909,306	$	14.32
Exercised		6,654	$	10.95
Forfeited		51,050	$	11.23
Expired		156,885	$	17.55
Outstanding - June 30, 2011		17,859,607	$	17.30		5.3	$	25
Exercisable - June 30, 2011		6,665,499	$	19.15		5.3	$	1
Vested and expected to vest - June 30, 2011		17,443,021	$	17.41		5.2	$	24

Weighted average grant date fair value table

	2011			2010
Expected term (in years)(1)		6.5			6.5
Risk-free interest rate(2)		2.7 — 3.2	%		2.9 — 3.3	%
Expected volatility(3)		31.2 — 31.7	%		35.0 — 37.6	%
Dividend yield(4)		—			—
Weighted average grant-date fair value (per option)	$	5.48		$	4.66

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(1) Expected term calculated using the simplified method prescribed by the SEC due to the lack of sufficient historical exercise data to provide a reasonable basis to estimate the expected term.

(2) Zero Coupon U.S. Treasury rate or equivalent based on expected term.

(3) Volatility calculated using the implied volatility of our exchange traded stock options.

(4) We have never paid cash dividends on our common stock, and it is not anticipated that any cash dividends will be paid on our common stock in the near future.

RSA and RSU rollforward table

	Number of Restricted Stock Awards		Weighted Average Grant-Date Fair Value
Nonvested - December 31, 2010		2,683,117	$	11.16
Granted		1,630,465	$	14.38
Forfeited		145,923	$	11.88
Vested		460,232	$	14.62
Nonvested - June 30, 2011		3,707,427	$	12.10