Revenue (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,970	$ 1,581
Contract with customer, asset, gross, current	2		$ 2
Contract with customer, liability	27		62
Performance obligation satisfied in previous period	1	3
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
Financing Receivable, Allowance for Credit Loss, Asset Held-for-Sale	1		0
Balance at end of period	7		$ 7
Plumbing Products (A)
Disaggregation of Revenue [Line Items]
Net sales	1,249	955
Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	721	626
North America
Disaggregation of Revenue [Line Items]
Net sales	1,529	1,258
North America | Plumbing Products (A)
Disaggregation of Revenue [Line Items]
Net sales	808	632
North America | Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	721	626
International, principally Europe
Disaggregation of Revenue [Line Items]
Net sales	441	323
International, principally Europe | Plumbing Products (A)
Disaggregation of Revenue [Line Items]
Net sales	441	323
International, principally Europe | Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0