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Discontinued Operations Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
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Assets and Liabilities Held for Sale [Line Items] |  |  |
Assets held for sale | $ 156 | $ 147 | $ 158
Building Solutions Asia Pacific | Individually immaterial disposal group [Member] |  |  |
Assets and Liabilities Held for Sale [Line Items] |  |  |
Assets held for sale | $ 156 | $ 147 |

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