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Long-Term Debt - CRC Senior Secured Notes due 2025 (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jul. 06, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Long-term debt |  |  |
Interest rate (as a percent) | 4.30% |  |
CRC Senior Secured Notes | Senior Notes |  |  |
Long-term debt |  |  |
Interest rate (as a percent) | 5.75% | 5.75% |
CRC Senior Secured Notes | Senior Notes | Estimate of Fair Value Measurement |  |  |
Long-term debt |  |  |
Long-term debt, gross | $ 1,000 | $ 1,000 |
CRC Senior Secured Notes | Senior Notes | Reported Value Measurement |  |  |
Long-term debt |  |  |
Long-term debt, gross | $ 978 |  | $ 0

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