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DEBT - Other (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Principal maturities of long-term debt |  |  |
2021 | $ 0 |  |
2022 | 0 |  |
2023 | 0 |  |
2024 | 99 |  |
2025 | 200 |  |
Thereafter | 300 |  |
Total | 599 | $ 725 | $ 5,000
Fair Value, Other Financial Instruments [Abstract] |  |  |
Estimated fair value of long-term debt | 599 |  | 3,800
Outstanding borrowings | $ 599 | $ 725 | $ 5,000

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