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Discontinued Operations Disposal Group - Assets Held For Sale (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Noncurrent assets held for sale | $ 155 | $ 147
Building Solutions Asia Pacific | Individually immaterial disposal group [Domain] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Disposal Group, Including Discontinued Operation, Assets | $ 155 | $ 147

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