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Stock-Based Compensation - Expense for performance based shares units (Details) - Performance Shares - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based payment arrangement, expense | $ 0 | $ 1 | $ 3 | $ 3
Total Stockholder Return |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based payment arrangement, expense | 2 | 0 | 3 | 3
Relative Revenue Growth |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based payment arrangement, expense | (3) | 1 | (1) | 0
Adjusted Earnings Per Share |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based payment arrangement, expense | $ 1 | $ 0 | $ 1 | $ 0

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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