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Significant Restructuring Costs Change in Restructuring Reserve - 2020 Restructuring Plan (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 62
Restructuring and impairment costs	62		$ 0	$ 173	$ 0
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs		$ 111
Payments for Restructuring	(25)	(8)
Restructuring Reserve, Settled without Cash		(54)
Restructuring Reserve	24	49		24
Employee Severance | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs		54
Payments for Restructuring	(24)	(8)
Restructuring Reserve, Settled without Cash		0
Restructuring Reserve	22	46		22
Long-Lived Asset Impairment | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs		54
Payments for Restructuring	0	0
Restructuring Reserve, Settled without Cash		(54)
Restructuring Reserve	0	0		0
Other Restructuring | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs		3
Payments for Restructuring	(1)	0
Restructuring Reserve, Settled without Cash		0
Restructuring Reserve	$ 2	3		$ 2
Global Products | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs		87
Building Solutions Asia Pacific | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs		10
Building Solutions EMEA/LA | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs		6
Building Solutions North America | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs		8
Continuing Operations | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs		$ 111

X

- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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