Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue		$ 11,503	$ 11,290	$ 10,116
Constant-currency adjustment	[1]	153	108	142
Net sales of reportable segments and All Other		11,656	11,398	10,258
Display Products [Member]
Revenue		3,180	3,168	2,997
Telecommunication Products [Member]
Revenue		4,064	4,192	3,545
Specialty Glass Products [Member]
Revenue		1,594	1,479	1,403
Environmental Substrate and Filter Products [Member]
Revenue		1,440	1,289	1,106
Life Science Products [Member]
Revenue		995	946	879
All Other [Member]
Revenue		$ 230	$ 216	$ 186

[1] This amount primarily represents the impact of foreign currency adjustments in the Display Technologies and Environmental Technologies segments. 2.Revenue (continued)