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Supplementary Financial Information - Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]    
Accrued Income Taxes, Noncurrent $ 20 $ 20
Contract with Customer, Liability, Noncurrent 19 21
Restructuring Reserve, Noncurrent 5 6
Other Sundry Liabilities, Noncurrent 37 44
Other long-term liabilities $ 81 $ 91