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Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock compensation plan, description |  |  | The 2022 Performance Plan was adopted by our shareholders on April 11, 2022 and will expire on February 28, 2032 unless earlier terminated. The 2022 Performance Plan replaced the 2017 Performance Plan, which was terminated on April 11, 2022, except with respect to outstanding awards. |
Stock-based compensation expense | $ 8 | $ 7 | $ 13 | $ 11
Unearned compensation cost related to the unvested portion of all stock-based awards | $ 39 |  | $ 39 |
Remaining vesting period |  |  | through the first quarter of 2025 |
Restricted Stock Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Equity instruments granted (shares) |  |  | 0.6 |
Weighted average fair value per share granted (dollars per share) |  |  | $ 15.66 |
Performance Share Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Equity instruments granted (shares) |  |  | 0.4 |
Weighted average fair value per share granted (dollars per share) |  |  | $ 15.60 |

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