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Supplementary Financial Information - Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
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