Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues by Products Categories	$ 3,008	$ 2,607	$ 8,255	$ 7,479
Display Products [Member]
Revenues by Products Categories	815	767	2,315	2,250
Telecommunication Products [Member]
Revenues by Products Categories	1,117	917	3,026	2,617
Specialty Glass Products [Member]
Revenues by Products Categories	459	373	1,080	1,010
Environmental Substrate and Filter Products [Member]
Revenues by Products Categories	331	277	970	815
Life Science Products [Member]
Revenues by Products Categories	231	223	708	654
All Other Products [Member]
Revenues by Products Categories	$ 55	$ 50	$ 156	$ 133