Common Stock, Preferred Stock and Equity Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 vote	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award
Common stock, shares authorized	300,000,000	300,000,000
Common stock, votes per share (votes per share)	1
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Awards Outstanding (shares)	14,909,805
Additional awards authorized for grant (shares)	10,552,371
Grant price of outstanding restricted stock and restricted stock units (usd per share)		$ 0.01	$ 0.01
Stock Options
Stock options outstanding at beginning of period (in shares)	15,729,000
Stock options granted (in shares)	3,614,000
Stock options exercised (in shares)	(6,153,000)
Stock options forfeited (in shares)	(1,173,000)
Stock options expired (in shares)	(14,000)
Stock options outstanding at end of period (in shares)	12,003,000	15,729,000
Stock options exercisable at end of period (in shares)	5,553,000
Total exercisable or expected to vest, stock options (in shares)	11,380,000
Weighted-average Exercise Price
Weighted-average exercise price outstanding at beginning of period (usd per share)	$ 44.40
Weighted average exercise price, granted (usd per share)	$ 84.33
Weighted average exercise price, exercised (usd per share)	$ 41.53
Weighted average exercise price, forfeited (usd per share)	$ 55.28
Weighted average exercise price, expired (usd per share)	$ 66.43
Weighted-average exercise price outstanding at end of period (usd per share)	$ 56.81	$ 44.40
Weighted average exercise price exercisable at the end of the period (usd per share)	$ 45.61
Total exercisable or expected to vest, weighted average exercise price (usd per share)	$ 55.94
Weighted-average Remaining Contractual Life
Weighted-average Remaining Contractual Life, outstanding (in years)	6 years 11 months 8 days
Weighted-average Remaining Contractual Life, exercisable (in years)	5 years 5 months 5 days
Weighted-average Remaining Contractual Life, total exercisable or expected to vest (in years)	6 years 10 months 6 days
Aggregate Intrinsic Value
Aggregate intrinsic value, outstanding	$ 761,274,000
Aggregate intrinsic value, exercisable	414,345,000
Aggregate intrinsic value, total exercisable or expected to vest	731,677,000
Total Intrinsic Value and Cash Received
Market price (usd per share)	$ 120.23
Total intrinsic value of stock options exercised	316,500,000	291,600,000	148,700,000
Total cash received from employees as a result of employee stock option exercises	$ 255,500,000	$ 246,800,000	$ 172,800,000
Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Expiration period (years)	10 years
2013 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	2,857,275
Additional awards authorized for grant (shares)	9,362,898
Additional shares authorized	9,500,000
Number of shares authorized		3,300,000
2006 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	11,428,741
Additional awards authorized for grant (shares)	1,189,473
Additional shares authorized			3,000,000
1996 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	623,789
Additional awards authorized for grant (shares)	0
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award
Grant price of outstanding restricted stock and restricted stock units (usd per share)	$ 0.01
Restricted stock vesting period	4 years