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Stock-Based Compensation - Stock Options (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2022 | Jun. 30, 2021
Stock-Based Compensation |  |  |
Unrecognized compensation expense |  | $ 212 |
Unrecognized compensation expense, recognition period |  | 1 year |
Aggregate intrinsic value, stock options and vesting RSA's |  | $ 8 | $ 115
Aggregate intrinsic value, outstanding |  | $ 91 |
Remaining term, outstanding (in years) |  | 7 years 6 months |
Aggregate intrinsic value, exercisable |  | $ 30 |
Remaining term, exercisable (in years) |  | 6 years 6 months |
ESPP |  |  |
Stock-Based Compensation |  |  |
Authorized (in shares) |  | 1,650,000 |
Additional shares authorized (in shares) |  | 1,100,000 |
Percentage increase of shares each anniversary |  | 5.00% |
Subscription rate cap |  | 15.00% |
Maximum discount rate |  | 85.00% |
Shares available for grant (in shares) |  | 700,000 |
2015 Plan |  |  |
Stock-Based Compensation |  |  |
Authorized (in shares) |  | 14,800,000 |
Additional shares authorized (in shares) |  | 2,400,000 |
Term (in years) | 10 years |  |
Minimum grant price, percent of common stock fair value | 100.00% |  |
Shares available for grant (in shares) |  | 4,834,171 |
2015 Plan | Minimum |  |  |
Stock-Based Compensation |  |  |
Vesting period | 1 year |  |
2015 Plan | Maximum |  |  |
Stock-Based Compensation |  |  |
Vesting period | 4 years |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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