Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 2,204	$ 1,983	$ 6,353	$ 5,328
Contract with customer, asset, gross, current	1		1		$ 2
Contract with customer, liability	24		24		62
Contract with customer, liability, revenue recognized	1	6
Performance obligation satisfied in previous period	3	1	7	6
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1			7	5	5
Provision for expected credit losses during the period			1		3
Write-offs charged against the allowance			(1)		(2)
Recoveries of amounts previously written off			1		1
Other			1		0
Balance at end of period	7		7		$ 7
Hüppe
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Other			1
Plumbing Products (A)
Disaggregation of Revenue [Line Items]
Net sales	1,329	1,141	3,907	2,964
Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	875	842	2,446	2,364
North America
Disaggregation of Revenue [Line Items]
Net sales	1,753	1,599	4,999	4,337
North America | Plumbing Products (A)
Disaggregation of Revenue [Line Items]
Net sales	878	757	2,553	1,973
North America | Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	875	842	2,446	2,364
International, principally Europe
Disaggregation of Revenue [Line Items]
Net sales	451	384	1,354	991
International, principally Europe | Plumbing Products (A)
Disaggregation of Revenue [Line Items]
Net sales	451	384	1,354	991
International, principally Europe | Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0