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Stock options granted initial vesting period.

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Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) period $ / shares shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018	Mar. 31, 2021 shares	Apr. 30, 2019 shares	Mar. 31, 2019 shares	Apr. 30, 2017 shares	Mar. 31, 2017 shares	Apr. 30, 2015 shares	Oct. 31, 2009 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised under stock option plans \| $	$ 613.0	$ 598.0	$ 512.0
Cash received from option exercises and employee stock purchase plans \| $	276.0	309.0	273.0
Employee service share-based compensation, tax benefit from exercise of stock options \| $	$ 138.0
Number of options vested and expected to vest \| shares	11,500,000
Weighted average remaining contractual life of shares vested and expected to vest, years	5 years
Aggregate intrinsic value of shares vested and expected to vest \| $	$ 2,720.0
Options vested and expected to vest, weighted-average exercise price per share \| $ / shares	$ 122.97
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares) \| shares	4,300,000
Aggregate intrinsic value \| $	$ 1,560.0
Vested in period, aggregate fair value \| $	578.0	$ 478.0	$ 433.0
Total unrecognized compensation expense \| $	$ 616.0
Weighted average period unrecognized compensation expenses are expected to be recognized, years	2 years 2 months 12 days
Restricted Stock Units (RSUs) \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Annual Grant Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon six months of service	12.50%
Percentage vesting per month after six months of service	2.0833%
Annual Grant Options \| August Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting at the end of one month	14.5833%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	2.0833%
Annual Grant Options \| February Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon six months of service	12.50%
Percentage vesting per month after six months of service	2.0833%
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares were reserved for future issuance (shares) \| shares	2,800,000
Employee stock purchase plan, shares issued \| shares	500,000	500,000	600,000
Employee stock purchase plan, value of shares issued \| $	$ 75.9	$ 71.2	$ 56.4
Total unrecognized compensation expense \| $	$ 38.0
Weighted average period unrecognized compensation expenses are expected to be recognized, years	1 year 6 months
Nonvested Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense \| $	$ 122.0
Weighted average period unrecognized compensation expenses are expected to be recognized, years	2 years 3 months 18 days
Initial RSU grants \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		33.3333%
New Hire Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting per month after one year	2.0833%
Percentage vesting upon one year of service	25.00%
2010 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Number of shares of common stock reserved for issuance (shares) \| shares					97,350,000	103,350,000
Shares were reserved for future issuance (shares) \| shares	25,500,000
2010 Incentive Award Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares were reserved for future issuance (shares) \| shares	11,100,000
2010 Incentive Award Plan \| Annual Grant Options \| August Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period	3 years 6 months
2010 Incentive Award Plan \| Annual Grant Options \| February Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period	4 years
2009 Employment Commencement Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Number of shares of common stock reserved for issuance (shares) \| shares									10,395,000	13,095,000
2000 Non-Employee Directors' Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Number of shares of common stock reserved for issuance (shares) \| shares											1,350,000
2000 Non-Employee Directors' Stock Option Plan \| Annual Grant Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period				1 year
2000 Non-Employee Directors' Stock Option Plan \| Initial Grant Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted initial vesting period, years				3 years
Percentage vesting per month after one year		2.7778%
Percentage vesting upon one year of service		33.3333%
2000 Employee Stock Purchase Plan \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum hours employed per week	20 hours
Minimum months employed per year	5 months
Maximum percentage of employees on stockholders to participate in ESPP	5.00%
Percentage of employee payroll deduction under the stock plan, maximum	15.00%
Duration for each offering period	24 months
Number of shorter purchase periods that each offering period is divided into \| period	4
Duration of each shorter offering period	6 months
Discount on fair market value on the offering date	85.00%
Discount on fair market value on the purchase date	85.00%
Period of look-back that could cause offering period to reset	2 years
Share-based compensation arrangement by share-based payment award, number of shares available for grant \| shares							18,270,945	22,770,945