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Other Liabilities - Long-Term Table (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other Liabilities Disclosure [Abstract] |  |
VPP deferred revenue | $ 0 | $ 9
Other | 5 | 116
Total other long-term liabilities | $ 5 | $ 125

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