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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 10 | $ 8 | $ 18 | $ 15
Long-term stock awards |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 7 | 7 | 12 | 12
Stock options |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 1 | 1 | 2 | 2
Restricted stock units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 1 | 1 | 2 | 2
Phantom stock awards and stock appreciation rights |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 1 | $ (1) | $ 2 | $ (1)

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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=109197908&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=109197908&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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