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Benefit Plans - 2015 Long-Term Stock Incentive Plan (Details) - 2015 Long-Term Stock Incentive Plan shares in Millions | 9 Months Ended
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Sep. 30, 2021 anniversary shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted stock conversion to common stock | 1
Common stock available for future grants (in shares) | shares | 128
Employees and Non Employee Stock Option |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock option expiration period | 10 years
Stock Option |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of award vesting anniversaries | anniversary | 3
Award vesting percentage | 25.00%
Restricted Stock Units (RSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting percentage | 25.00%
Performance-based Share Awards | Share-based Payment Arrangement, Tranche One |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting period | 2 years
Award vesting percentage | 25.00%
Performance-based Share Awards | Share-based Payment Arrangement, Tranche Two |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting period | 3 years
Award vesting percentage | 25.00%
Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting period | 3 years
Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting period | 4 years

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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