Preferred Stock, Common Stock and Equity Plans (Details 2) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restricted stock
Restricted stock, as of the beginning of the period (in shares)	1,931	0
Restricted stock, granted (in shares)	1,185
Restricted stock, vested (in shares)	(747)
Restricted stock, cancelled (in shares)	(269)
Restricted stock, as of the end of the period (in shares)	2,100	1,931	0
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)	$ 33.35
Weighted-average grant-date fair value, granted (in dollars per share)	$ 41.04
Weighted-average grant-date fair value, vested (in dollars per share)	$ 33.97
Weighted-average grant-date fair value, cancelled (in dollars per share)	$ 36.01
Weighted-average grant-date fair value, as of the end of the period (in dollars per share)	$ 37.13	$ 33.35
Total fair value of restricted stock vesting measured on the date of vesting	$ 34.6	$ 20.1	$ 26.5
Range of Exercise Prices, $9.07-$20.00
Restricted stock, weighted-average grant-date fair value
Exercise price, low end of range (in dollars per share)	$ 9.07
Exercise price, high end of range (in dollars per share)	$ 20.00
Exercise price range, options outstanding (in shares)	2,751
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	2.99
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 15.52
Exercise price range, options exercisable (in shares)	2,689
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 15.44
Range of Exercise Prices, $20.01-$30.00
Restricted stock, weighted-average grant-date fair value
Exercise price, low end of range (in dollars per share)	$ 20.01
Exercise price, high end of range (in dollars per share)	$ 30.00
Exercise price range, options outstanding (in shares)	1,902
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	6.71
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 28.89
Exercise price range, options exercisable (in shares)	1,363
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 28.61
Range of Exercise Prices, $30.01-$40.00
Restricted stock, weighted-average grant-date fair value
Exercise price, low end of range (in dollars per share)	$ 30.01
Exercise price, high end of range (in dollars per share)	$ 40.00
Exercise price range, options outstanding (in shares)	13,790
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	7.16
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 35.70
Exercise price range, options exercisable (in shares)	7,804
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 35.17
Range of Exercise Prices, $40.01-$50.00
Restricted stock, weighted-average grant-date fair value
Exercise price, low end of range (in dollars per share)	$ 40.01
Exercise price, high end of range (in dollars per share)	$ 50.00
Exercise price range, options outstanding (in shares)	403
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	9.04
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 44.53
Exercise price range, options exercisable (in shares)	69
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 44.54
Range of Exercise Prices, $50.01-$57.27
Restricted stock, weighted-average grant-date fair value
Exercise price, low end of range (in dollars per share)	$ 50.01
Exercise price, high end of range (in dollars per share)	$ 57.27
Exercise price range, options outstanding (in shares)	2,077
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	9.47
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)	$ 52.17
Exercise price range, options exercisable (in shares)	300
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)	$ 53.12