Reportable Segments (Selected Financial Information On Product Lines and Reportable Segments) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales		$ 3,035	$ 3,008	$ 2,747	$ 2,500	$ 2,637	$ 2,607	$ 2,497	$ 2,375	$ 11,290	$ 10,116	$ 9,390
All Other [Member]
Net sales										216	188	152
Operating Segments [Member]
Net sales	[1]									11,398	10,258	9,440
Operating Segments [Member] | Display Technologies [Member]
Net sales										3,276	3,137	3,288
Operating Segments [Member] | Optical Communications [Member]
Net sales										4,192	3,545	3,005
Operating Segments [Member] | Optical Communications [Member] | Carrier Network [Member]
Net sales										3,084	2,720	2,274
Operating Segments [Member] | Optical Communications [Member] | Enterprise Network [Member]
Net sales										1,108	825	731
Operating Segments [Member] | Environmental Technologies [Member]
Net sales										1,289	1,106	1,032
Operating Segments [Member] | Environmental Technologies [Member] | Automotive and Other [Member]
Net sales										719	627	585
Operating Segments [Member] | Environmental Technologies [Member] | Diesel [Member]
Net sales										570	479	447
Operating Segments [Member] | Specialty Materials [Member]
Net sales										1,479	1,403	1,124
Operating Segments [Member] | Specialty Materials [Member] | Corning Gorilla Glass [Member]
Net sales										1,069	1,044	807
Operating Segments [Member] | Specialty Materials [Member] | Advanced Optics And Other Specialty Glass [Member]
Net sales										410	359	317
Operating Segments [Member] | Life Sciences [Member]
Net sales										946	879	839
Operating Segments [Member] | Life Sciences [Member] | Labware [Member]
Net sales										536	524	512
Operating Segments [Member] | Life Sciences [Member] | Cell Culture Products [Member]
Net sales										410	355	327
Operating Segments [Member] | All Other [Member]
Net sales										$ 216	$ 188	$ 152

[1] Net sales are attributed to countries based on location of customer.