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Discontinued Operations Disposal Group - Assets Held For Sale (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
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