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Supplementary Financial Information - Other Long-Term Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Condensed Financial Information Disclosure [Abstract] |  |
Deferred payroll tax related to the CARES Act | $ 24 | $ 24
Income tax liabilities | 15 | 15
Unearned income | 40 | 29
Restructuring liabilities | 0 | 5
Other | 34 | 35
Other long-term liabilities | $ 113 | $ 108

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