Significant Restructuring Costs Change in Restructuring Reserve - 2021 Restructuring Plan (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	$ 49	$ 0
2021 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Total Expected Cost	385
Restructuring and impairment costs	49		$ 242
Payments for Restructuring	(20)		(79)
Restructuring Reserve, Settled without Cash			(98)
Currency Translation	(1)
Restructuring Reserve	93		65
Restructuring and Related Cost, Cost Incurred to Date	291
2021 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	28		68
Payments for Restructuring	(13)		(28)
Restructuring Reserve, Settled without Cash			0
Currency Translation	(1)
Restructuring Reserve	54		40
2021 Restructuring Plan | Long-Lived Asset Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	0		98
Payments for Restructuring	0		0
Restructuring Reserve, Settled without Cash			(98)
Currency Translation	0
Restructuring Reserve	0		0
2021 Restructuring Plan | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	21		76
Payments for Restructuring	(7)		(51)
Restructuring Reserve, Settled without Cash			0
Currency Translation	0
Restructuring Reserve	39		$ 25
2021 Restructuring Plan | Global Products
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	24
Restructuring and Related Cost, Cost Incurred to Date	115
2021 Restructuring Plan | Building Solutions North America
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	9
Restructuring and Related Cost, Cost Incurred to Date	79
2021 Restructuring Plan | Building Solutions Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	8
Restructuring and Related Cost, Cost Incurred to Date	36
2021 Restructuring Plan | Building Solutions EMEA/LA
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	5
Restructuring and Related Cost, Cost Incurred to Date	34
2021 Restructuring Plan | Corporate Segment
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	3
Restructuring and Related Cost, Cost Incurred to Date	$ 27