Stock-Based Compensation (Details 3) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock options
Number of shares outstanding (in shares)
Balance at the beginning of the period (in shares)	6,891	7,654	8,414
Granted (in shares)	335	629	321
Exercised (in shares)	(947)	(1,265)	(784)
Forfeited (in shares)	(159)	(127)	(297)
Balance at the end of the period (in shares)	6,120	6,891	7,654
Weighted-Average Exercise Price of Outstanding Options (in dollars per share)
Balance at the beginning of the period, Weighted-Average Exercise Price of Outstanding Options (in dollars per share)	$ 18.62	$ 16.91	$ 16.63
Granted, Weighted-Average Exercise Price of Outstanding Options (in dollars per share)	$ 21.91	$ 21.98	$ 14.90
Exercised, Weighted-Average Exercise Price of Outstanding Options (in dollars per share)	$ 7.98	$ 8.87	$ 9.60
Forfeited, Weighted-Average Exercise Price of Outstanding Options (in dollars per share)	$ 24.43	$ 29.15	$ 26.17
Balance at the end of the period, Weighted-Average Exercise Price of Outstanding Options (in dollars per share)	$ 20.30	$ 18.62	$ 16.91
Weighted-average assumptions
Risk-free interest rate, minimum (as a percent)	0.74%	1.10%	1.11%
Risk-free interest rate, maximum (as a percent)	1.17%	2.57%	2.82%
Volatility rate, minimum (as a percent)	55.00%	49.00%	48.00%
Volatility rate, maximum (as a percent)	60.00%	55.00%	52.00%
Weighted-average estimated fair value of ESPP issuances (in dollars per share)	$ 11.50	$ 11.11	$ 7.41
Aggregate intrinsic value of options outstanding	$ 30.0
Aggregate intrinsic value of options exercisable	28.1
Total intrinsic value of options exercised	15.2	17.1	7.2
Total estimated fair value of options vested	$ 4.1	$ 6.4	$ 8.2
Stock options | Minimum
Weighted-average assumptions
Expected life	5 years	5 years	5 years
Stock options | Maximum
Weighted-average assumptions
Expected life	6 years	6 years	6 years
RSUs
Number of shares outstanding, RSUs and RSAs
Balance at the beginning of the period (in shares)	1,542	1,897	2,042
Granted (in shares)	528	471	1,170
Released RSUs and RSAs (in shares)	(752)	(797)	(657)
Forfeited (in shares)	(78)	(29)	(658)
Balance at the end of the period (in shares)	1,240	1,542	1,897
Weighted-Average Exercise Price of Outstanding Awards (in dollars per share)
Balance at the beginning of the period (in dollars per share)	$ 15.47	$ 12.45	$ 14.15
Granted (in dollars per share)	$ 18.45	$ 24.96	$ 10.55
Released RSUs and RSAs (in dollars per share)	$ 14.19	$ 13.89	$ 13.20
Forfeited (in dollars per share)	$ 18.48	$ 15.35	$ 26.26
Balance at the end of the period (in dollars per share)	$ 17.32	$ 15.47	$ 12.45
RSUs and RSAs performance-contingent
Number of shares outstanding, RSUs and RSAs
Balance at the beginning of the period (in shares)	2,442	33	57
Granted (in shares)	447	2,483
Released RSUs and RSAs (in shares)	(388)	(74)	(24)
Balance at the end of the period (in shares)	2,501	2,442	33
Weighted-Average Exercise Price of Outstanding Awards (in dollars per share)
Balance at the beginning of the period (in dollars per share)	$ 24.62	$ 26.10	$ 25.87
Granted (in dollars per share)	$ 18.11	$ 24.61
Released RSUs and RSAs (in dollars per share)	$ 24.77	$ 24.96	$ 25.55
Balance at the end of the period (in dollars per share)	$ 23.43	$ 24.62	$ 26.10
Employee stock purchase plan issuances
Weighted-average assumptions
Risk-free interest rate, minimum (as a percent)	0.14%	0.05%	0.19%
Risk-free interest rate, maximum (as a percent)	0.29%	0.54%	0.79%
Volatility rate, minimum (as a percent)	51.00%	48.00%	50.00%
Volatility rate, maximum (as a percent)	64.00%	59.00%	69.00%
Weighted-average estimated fair value of ESPP issuances (in dollars per share)	$ 8.07	$ 9.46	$ 7.63
Employee stock purchase plan issuances | Minimum
Weighted-average assumptions
Expected life	6 months	6 months	6 months
Employee stock purchase plan issuances | Maximum
Weighted-average assumptions
Expected life	2 years	2 years	2 years