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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Segment Information
Net sales	$ 2,297			$ 2,066		$ 4,217	$ 3,844
Operating Profit (Loss)	358	$ 256	$ 309	372	$ 257	602	629	$ 938	$ 1,194	$ 1,087
Other income (expense), net	(46)			(110)		(90)	(157)
Income before income taxes	312			262		512	472
North America
Segment Information
Net sales	1,872			1,668		3,388	3,080
International, principally Europe
Segment Information
Net sales	425			398		829	764
Plumbing Products
Segment Information
Net sales	1,032			949		2,003	1,821
Plumbing Products | North America
Segment Information
Net sales	647			605		1,252	1,162
Plumbing Products | International, principally Europe
Segment Information
Net sales	385			344		751	659
Decorative Architectural Products
Segment Information
Net sales	806			661		1,351	1,157
Decorative Architectural Products | North America
Segment Information
Net sales	806			661		1,351	1,157
Decorative Architectural Products | International, principally Europe
Segment Information
Net sales	0			0		0	0
Cabinetry Products
Segment Information
Net sales	268			251		485	482
Cabinetry Products | North America
Segment Information
Net sales	268			238		485	457
Cabinetry Products | International, principally Europe
Segment Information
Net sales	0			13		0	25
Windows and Other Specialty Products
Segment Information
Net sales	191			205		378	384
Windows and Other Specialty Products | North America
Segment Information
Net sales	151			164		300	304
Windows and Other Specialty Products | International, principally Europe
Segment Information
Net sales	40			41		78	80
Operating Segments
Segment Information
Net sales	2,297	1,853	1,945	2,066	1,778	4,217	3,844	5,789	7,642	7,361
Operating Profit (Loss)	380	277	331	398	280	642	678	1,009	1,286	1,181
Operating Segments | Plumbing Products
Segment Information
Net sales	1,032	961	950	949	872	2,003	1,821	2,771	3,732	3,529
Operating Profit (Loss)	194	165	175	200	162	357	362	537	702	654
Operating Segments | Decorative Architectural Products
Segment Information
Net sales	806	487	562	661	496	1,351	1,157	1,719	2,206	2,092
Operating Profit (Loss)	145	83	112	149	94	234	243	355	438	433
Operating Segments | Cabinetry Products
Segment Information
Net sales	268	223	229	251	231	485	482	711	934	970
Operating Profit (Loss)	33	25	20	31	16	39	47	67	92	97
Operating Segments | Windows and Other Specialty Products
Segment Information
Net sales	191	182	204	205	179	378	384	588	770	770
Operating Profit (Loss)	8	4	24	18	8	12	26	50	54	(3)
Geographic Areas
Segment Information
Net sales	2,297			2,066		4,217	3,844
Operating Profit (Loss)	380			398		642	678
Geographic Areas | North America
Segment Information
Net sales	1,872			1,668		3,388	3,080
Operating Profit (Loss)	323			340		541	578
Geographic Areas | International, principally Europe
Segment Information
Net sales	425			398		829	764
Operating Profit (Loss)	57			58		101	100
Corporate, Non-Segment
Segment Information
General corporate expense, net	$ (22)	$ (21)	$ (22)	$ (26)	$ 23	$ (40)	$ (49)	$ (71)	$ (92)	$ (94)

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