Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 1,983	$ 1,716	$ 5,328	$ 5,068
Contract with customer, asset, gross, current	2		2		$ 2
Contract with customer, liability	25		25		$ 40
Contract with customer, liability, revenue recognized	6	2
Performance obligation satisfied in previous period	1		6	1
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1 (after adopting ASU 2016-13)			5
Provision for expected credit losses during the period			2
Write-offs charged against the allowance			(1)
Recoveries of amounts previously written off			1
Balance at end of period	7		7
Plumbing Products
Disaggregation of Revenue [Line Items]
Net sales	1,141	1,006	2,964	2,958
Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	842	710	2,364	2,110
North America
Disaggregation of Revenue [Line Items]
Net sales	1,599	1,374	4,337	4,033
North America | Plumbing Products
Disaggregation of Revenue [Line Items]
Net sales	757	664	1,973	1,923
North America | Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	842	710	2,364	2,110
International, principally Europe
Disaggregation of Revenue [Line Items]
Net sales	384	342	991	1,035
International, principally Europe | Plumbing Products
Disaggregation of Revenue [Line Items]
Net sales	384	342	991	1,035
International, principally Europe | Decorative Architectural Products
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0