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Share-Based Compensation - Performance Share Unit Breakout (Details) $ in Millions | Apr. 14, 2020 | Apr. 13, 2020 | Sep. 30, 2020 USD ($) shares | Dec. 31, 2019 USD ($)
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COMMON STOCK |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock split, conversion ratio | 0.005 | 0.005 |  |
Cash Restricted Stock Units | Award Year 2018, Payable 2020 and 2021 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Units | shares |  |  | 14,273 |
Fair Value |  |  | $ 0 | $ 9
Vested Liability |  |  | $ 0 |

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