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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Compensation expense |  |  |  |  |  | $ 2
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Restricted shares granted to employees (in shares) | 9,000 | 31,000 | 766,000 |  |  |
Unrecognized compensation | $ 38 |  |  |  | $ 38 |
Period for recognition (in years) |  |  |  |  | 1 year 3 months 18 days |
Restricted stock or unit expense | $ 7 |  |  | $ 8 | $ 22 | $ 22
Restricted Stock | Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Restricted shares granted to employees (in shares) |  |  |  |  | 775,705 |
Restricted Stock | Employee | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting rights (in percentage) |  |  |  |  | 50.00% |
Award vesting period (in years) |  |  |  |  | 2 years |
Restricted Stock | Employee | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  | 3 years |
Restricted Stock | Non-employee director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Restricted shares granted to employees (in shares) |  |  |  |  | 30,674 |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  | 3 years |
Performance Shares | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting rights (in percentage) |  |  |  |  | 33.00% |
Performance Shares | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting rights (in percentage) |  |  |  |  | 33.00% |
Performance Shares | Share-based Payment Arrangement, Tranche Three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting rights (in percentage) |  |  |  |  | 33.00% |
2018 Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of shares authorized (in shares) | 7,000,000 |  |  |  | 7,000,000 |
Number of shares available for grant (in shares) | 5,000,000 |  |  |  | 5,000,000 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (i) -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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