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Summary of Significant Accounting Policies - Other Balance Sheet Information (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Accounting Policies [Abstract] |  |
Property, plant and equipment accumulated depreciation | $ 1,543 | $ 1,936
Intangible assets accumulated amortization | $ 1,542 | $ 1,357

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