Common Stock, Preferred Stock and Equity Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 vote	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award
Common stock, shares authorized (shares)	300,000,000	300,000,000
Common stock, votes per share (votes per share)	1
Preferred stock, shares authorized (shares)	1,000,000	1,000,000
Awards Outstanding (shares)	17,894,079
Additional awards authorized for grant (in shares)	5,411,351
Grant price of outstanding restricted stock and restricted stock units (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Outstanding and exercisable options
Stock options outstanding at beginning of period (in shares)	19,726,000
Stock options granted (in shares)	4,840,000
Stock options exercised (in shares)	(6,995,000)
Stock options forfeited (in shares)	(1,822,000)
Stock options expired (in shares)	(20,000)
Stock options outstanding at end of period (in shares)	15,729,000	19,726,000
Stock options exercisable at end of period (in shares)	7,950,000
Total exercisable or expected to vest, stock options (in shares)	14,967,000
Weighted average Exercise Price
Weighted-average exercise price outstanding at beginning of period (usd per share)	$ 38.09
Weighted average exercise price, granted (usd per share)	$ 57.87
Weighted average exercise price, exercised (usd per share)	$ 35.28
Weighted average exercise price, forfeited (usd per share)	$ 46.89
Weighted average exercise price, expired (usd per share)	$ 46.64
Weighted-average exercise price outstanding at end of period (usd per share)	$ 44.40	$ 38.09
Weighted average exercise price exercisable at the end of the period (usd per share)	$ 38.84
Total exercisable or expected to vest, weighted average exercise price (usd per share)	$ 43.95
Weighted-average Remaining Contractual Life
Weighted-average Remaining Contractual Life, outstanding (in years)	6 years 8 months 1 day
Weighted-average Remaining Contractual Life, exercisable (in years)	5 years 1 month 17 days
Weighted-average Remaining Contractual Life, total exercisable or expected to vest (in years)	6 years 6 months 22 days
Aggregate Intrinsic Value
Aggregate intrinsic value, outstanding	$ 481,311,000
Aggregate intrinsic value, exercisable	283,146,000
Aggregate intrinsic value, total exercisable or expected to vest	463,885,000
Total Intrinsic Value and Cash Received
Market price	$ 74.21
Total intrinsic value of stock options exercised	291,600,000	148,700,000	90,500,000
Total cash received from employees as a result of employee stock option exercises	$ 246,800,000	$ 172,800,000	$ 109,600,000
2013 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Common stock, shares authorized (shares)	3,300,000
Awards Outstanding (shares)	1,170,827
Additional awards authorized for grant (in shares)	2,129,173
2006 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	15,748,949
Additional awards authorized for grant (in shares)	3,282,178	3,000,000
1996 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	974,303
Additional awards authorized for grant (in shares)	0
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock, vested (in shares)	4 years