Segment Information (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Segment Information
Net sales	$ 1,920				$ 1,778
Operating Profit (Loss)	244	$ 256	$ 309	$ 372	257	$ 629	$ 938	$ 1,194	$ 1,087
Other income (expense), net	(44)				(47)
Income before income taxes	200				210
Operating Segments
Segment Information
Net sales	1,920	1,853	1,945	2,066	1,778	3,844	5,789	7,642	7,361
Operating Profit (Loss)	262	277	331	398	280	678	1,009	1,286	1,181
Operating Segments | Plumbing Products
Segment Information
Net sales	971	961	950	949	872	1,821	2,771	3,732	3,529
Operating Profit (Loss)	163	165	175	200	162	362	537	702	654
Operating Segments | Decorative Architectural Products
Segment Information
Net sales	545	487	562	661	496	1,157	1,719	2,206	2,092
Operating Profit (Loss)	89	83	112	149	94	243	355	438	433
Operating Segments | Cabinetry Products
Segment Information
Net sales	217	223	229	251	231	482	711	934	970
Operating Profit (Loss)	6	25	20	31	16	47	67	92	97
Operating Segments | Windows and Other Specialty Products
Segment Information
Net sales	187	182	204	205	179	384	588	770	770
Operating Profit (Loss)	4	4	24	18	8	26	50	54	(3)
Geographic Areas
Segment Information
Net sales	1,920				1,778
Operating Profit (Loss)	262				280
Geographic Areas | North America
Segment Information
Net sales	1,516				1,412
Operating Profit (Loss)	218				238
Geographic Areas | International, principally Europe
Segment Information
Net sales	404				366
Operating Profit (Loss)	44				42
Corporate, Non-Segment
Segment Information
General corporate expense, net	$ (18)	$ 21	$ (22)	$ (26)	$ (23)	$ (49)	$ (71)	$ (92)	$ (94)