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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 12 | $ 6 | $ 21 | $ 15
Long-term stock awards |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 7 | 7 | 13 | 12
Stock options |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 1 | 0 | 2 | 1
Restricted stock units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 1 | 0 | 1 | 0
Phantom stock awards and stock appreciation rights |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 3 | $ (1) | $ 5 | $ 2

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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://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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