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Stock-Based Compensation - Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | $ 41 | $ 37 | $ 30
Income tax benefit | (10) | (9) | (11)
Total stock-based compensation expense, net of income taxes | 31 | 28 | 19
Unrecognized compensation cost for all stock-based compensation awards | $ 29 |  |
Weighted average period for recognition of unrecognized compensation cost for all stock-based compensation awards | 1 year 9 months 18 days |  |
Tax benefit from exercise of stock options and other awards | $ 7 |  |
Selling, general and administrative expense |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 36 | 33 | 27
System operations expense |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 5 | 4 | 3
Long-Term Incentive Plans | Stock Options |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 0 | 2 | 6
Long-Term Incentive Plans | Restricted Stock Units |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 22 | 21 | 19
Long-Term Incentive Plans | Performance Shares |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 18 | 13 | 4
Non-Employee Directors' Plan |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | $ 1 | $ 1 | $ 1

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