Common Stock, Preferred Stock and Equity Plans (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options outstanding and exercisable
Exercise price range, options outstanding (in shares)	12,003,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	6 years 11 months 8 days
Exercise price range, options outstanding, weighted-average exercise price (usd per share)	$ 56.81
Exercise price range, options exercisable (in shares)	5,553,000
Exercise price range, options exercisable, weighted-average exercise price (usd per share)	$ 45.61
Restricted stock
Restricted stock, as of the beginning of the period (in shares)	2,046,000
Restricted stock, granted (in shares)	1,897,000
Restricted stock, vested (in shares)	(595,000)
Restricted stock, cancelled (in shares)	(441,000)
Restricted stock, as of the end of the period (in shares)	2,907,000	2,046,000
Restricted stock, weighted-average grant-date fair value
Weighted-average grant-date fair value, as of the beginning of the period (usd per share)	$ 52.66
Weighted-average grant-date fair value, granted (usd per share)	$ 92.00
Weighted-average grant-date fair value, vested (usd per share)	$ 50.65
Weighted-average grant-date fair value, cancelled (usd per share)	$ 56.36
Weighted-average grant-date fair value, as of the end of the period (usd per share)	$ 78.18	$ 52.66
Vested in period, total fair value	$ 54.5	$ 50.9	$ 41.1
$10.41–$20.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)	$ 10.41
Exercise price, high end of range (usd per share)	$ 20.00
Exercise price range, options outstanding (in shares)	214,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	2 years 3 months
Exercise price range, options outstanding, weighted-average exercise price (usd per share)	$ 17.66
Exercise price range, options exercisable (in shares)	214,000
Exercise price range, options exercisable, weighted-average exercise price (usd per share)	$ 17.66
$20.01–$40.00
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)	$ 40
Exercise price range, options outstanding (in shares)	3,702,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	4 years 4 months 24 days
Exercise price range, options outstanding, weighted-average exercise price (usd per share)	$ 35.07
Exercise price range, options exercisable (in shares)	2,989,000
Exercise price range, options exercisable, weighted-average exercise price (usd per share)	$ 34.73
$40.01–$60.00
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)	$ 60
Exercise price range, options outstanding (in shares)	3,690,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	7 years 5 months 16 days
Exercise price range, options outstanding, weighted-average exercise price (usd per share)	$ 48.52
Exercise price range, options exercisable (in shares)	1,435,000
Exercise price range, options exercisable, weighted-average exercise price (usd per share)	$ 50.48
$60.01–$80.00
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)	$ 80
Exercise price range, options outstanding (in shares)	1,980,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	8 years 10 months 6 days
Exercise price range, options outstanding, weighted-average exercise price (usd per share)	$ 76.13
Exercise price range, options exercisable (in shares)	442,000
Exercise price range, options exercisable, weighted-average exercise price (usd per share)	$ 74.76
$80.01–$100.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)	$ 80.01
Exercise price, high end of range (usd per share)	$ 100
Exercise price range, options outstanding (in shares)	2,401,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	8 years 10 months 13 days
Exercise price range, options outstanding, weighted-average exercise price (usd per share)	$ 90.23
Exercise price range, options exercisable (in shares)	473,000
Exercise price range, options exercisable, weighted-average exercise price (usd per share)	$ 84.90
$100.01–$112.48
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)	$ 100
Exercise price, high end of range (usd per share)	$ 112
Exercise price range, options outstanding (in shares)	16,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)	9 years 9 months 29 days
Exercise price range, options outstanding, weighted-average exercise price (usd per share)	$ 110.58
Exercise price range, options exercisable (in shares)	0
Exercise price range, options exercisable, weighted-average exercise price (usd per share)	$ 0.00
Employee Stock Purchase Plan
Employee Stock Purchase Plan
Offering period (in months)	12 months
Number of purchase periods	2
Duration of purchase period	6 months
Eligible employee purchase price percentage of fair value	85.00%
Number of shares authorized	1,396,227
Number of shares	357,000
Average price paid per share (usd per share)	$ 53.65