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Stock-Based Compensation - Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | $ 24 | $ 27 | $ 32
Income tax benefit | (6) | (7) | (8)
Total stock-based compensation expense, net of income taxes | 18 | 20 | 24
Unrecognized compensation cost for all stock-based compensation awards | $ 36 |  |
Weighted average period for recognition of unrecognized compensation cost for all stock-based compensation awards | 1 year 10 months 24 days |  |
Tax benefit from exercise of stock options and other awards | $ 4 |  |
Selling, general and administrative expense |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 20 | 23 | 28
System operations expense |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 4 | 4 | 4
Long-Term Incentive Plans | Restricted Stock Units |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 18 | 16 | 21
Long-Term Incentive Plans | Performance Shares |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | 5 | 10 | 10
Non-Employee Directors' Plan |  |  |
Stock based compensation expense |  |  |
Total stock-based compensation expense, before income taxes | $ 1 | $ 1 | $ 1

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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