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Supplementary Financial Information - Other Long-Term Assets (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Condensed Financial Information Disclosure [Abstract] |  |
Capitalized Computer Software, Net | $ 158 | $ 150
Deferred Costs, Noncurrent | 75 | 84
Product Software, Net | 61 | 40
Capitalized Cloud Computing Implementation Cost, Net | 41 | 40
Other Assets, Miscellaneous, Noncurrent | 67 | 73
Other long-term assets | $ 402 | $ 387

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