Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 2,179	$ 1,764	$ 4,149	$ 3,345
Contract with customer, asset, gross, current	1		1		$ 2
Contract with customer, liability	24		24		62
Contract with customer, liability, revenue recognized	1	3
Performance obligation satisfied in previous period	3	2	4	5
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	868	2,578	1,823
Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	850	896	1,571	1,522
North America
Disaggregation of Revenue [Line Items]
Net sales	1,717	1,480	3,246	2,738
North America | Plumbing Products (A)
Disaggregation of Revenue [Line Items]
Net sales	867	584	1,675	1,216
North America | Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	850	896	1,571	1,522
International, principally Europe
Disaggregation of Revenue [Line Items]
Net sales	462	284	903	607
International, principally Europe | Plumbing Products (A)
Disaggregation of Revenue [Line Items]
Net sales	462	284	903	607
International, principally Europe | Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0