Common Stock, Preferred Stock and Equity Plans (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted stock
Restricted stock, as of the beginning of the period (in shares)		2,100,000
Restricted stock, granted (in shares)		1,428,000
Restricted stock, vested (in shares)		(998,000)
Restricted stock, cancelled (in shares)		(260,000)
Restricted stock, as of the end of the period (in shares)	2,270,000	2,270,000	2,100,000
Restricted stock, weighted-average grant-date fair value
Weighted-average grant-date fair value, as of the beginning of the period (in dollars per share)		$ 37.13
Weighted-average grant-date fair value, granted (in dollars per share)		$ 45.46
Weighted-average grant-date fair value, vested (in dollars per share)		$ 35.11
Weighted-average grant-date fair value, cancelled (in dollars per share)	$ 40.09	$ 40.09
Weighted-average grant-date fair value, as of the end of the period (in dollars per share)	$ 42.92	$ 42.92	$ 37.13
Vested in period, total fair value	$ 41.1		$ 34.6	$ 20.1
Range of Exercise Prices, $9.07-$20.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 9.07
Exercise price, high end of range (usd per share)		$ 20.00
Exercise price range, options outstanding (in shares)	1,000,000	1,000,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	3.12	3.12
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 15.38	$ 15.38
Exercise price range, options exercisable (in shares)	1,000,000	1,000,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 15.38	$ 15.38
Range of Exercise Prices, $20.01-$30.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 20.01
Exercise price, high end of range (usd per share)		$ 30.00
Exercise price range, options outstanding (in shares)	1,415,000	1,415,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	6.35	6.35
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 29.30	$ 29.30
Exercise price range, options exercisable (in shares)	1,039,000	1,039,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 29.11	$ 29.11
Range of Exercise Prices, $30.01-$40.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 30.01
Exercise price, high end of range (usd per share)		$ 40.00
Exercise price range, options outstanding (in shares)	12,590,000	12,590,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	6.86	6.86
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 36.09	$ 36.09
Exercise price range, options exercisable (in shares)	7,770,000	7,770,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 35.29	$ 35.29
Range of Exercise Prices, $40.01-$50.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 40.01
Exercise price, high end of range (usd per share)		$ 50.00
Exercise price range, options outstanding (in shares)	2,331,000	2,331,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	9.32	9.32
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 48.04	$ 48.04
Exercise price range, options exercisable (in shares)	216,000	216,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 46.92	$ 46.92
Range of Exercise Prices, $50.01-$60.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 50.01
Exercise price, high end of range (usd per share)		$ 60.00
Exercise price range, options outstanding (in shares)	2,328,000	2,328,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	8.68	8.68
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 53.41	$ 53.41
Exercise price range, options exercisable (in shares)	816,000	816,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 54.18	$ 54.18
Price Range From Dollars $60.01-$64.30
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 60.01
Exercise price, high end of range (usd per share)		$ 64.30
Exercise price range, options outstanding (in shares)	62,000	62,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	9.34	9.34
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 63.17	$ 63.17
Exercise price range, options exercisable (in shares)	8,000	8,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 63.14	$ 63.14
Employee Stock Purchase Plan
Employee Stock Purchase Plan
Share purchase period range, maximum		6 months
Eligible employee purchase price percentage of fair value		85.00%
Initial offering period		12 months
Approved increase in number of shares authorized for issuance (in shares)		2,500,000
Number of shares authorized	2,280,000	2,280,000
Number of shares		702,000
Average price paid per share	$ 26.71	$ 26.71
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Number of Share Purchase Periods		2,000