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Stock-Based Compensation - Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | $ 37 | $ 30 | $ 26
Income tax benefit | (9) | (11) | (10)
Total stock-based compensation expense, net of income taxes | 28 | 19 | 16
Unrecognized compensation cost for all stock-based compensation awards | $ 33 |  |
Weighted average period for recognition of unrecognized compensation cost for all stock-based compensation awards | 1 year 7 months 6 days |  |
Tax benefit from exercise of stock options and other awards | $ 9 |  |
Selling, general and administrative expense |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 33 | 27 | 23
System operations expense |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 4 | 3 | 3
Long-Term Incentive Plans | Stock Options |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 2 | 6 | 11
Long-Term Incentive Plans | Restricted Stock Units |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 21 | 19 | 14
Long-Term Incentive Plans | Performance Shares |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 13 | 4 | 0
Non-Employee Directors' Plan |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | $ 1 | $ 1 | $ 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 The amount of expense, net of income tax, 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 No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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