Impairment of Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use		$ 54
Global Retail
Impairment of Long Lived Assets [Line Items]
Other Asset Impairment Charges	$ 36
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	$ 86		$ 86
Building Solutions North America
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use		29
Global Products
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use		16
Corporate Segment
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use		5
Building Solutions Asia Pacific
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use		$ 4