Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 3,001		$ 2,934	$ 7,953	$ 8,686
Cumulative adjustment related to customer contract		$ 105		(105)
Net sales of reportable segments and All Other	3,007		2,969	8,124	8,805
Foreign Currency Gain (Loss) [Member]
Impact of foreign currency movements	6		35	66	119
Revenue Adjustments [Member]
Cumulative adjustment related to customer contract				105
Display Products [Member]
Revenue	834		780	2,211	2,395
Telecommunication Products [Member]
Revenue	909		1,008	2,587	3,162
Specialty Glass Products [Member]
Revenue	570		463	1,339	1,141
Environmental Substrate and Filter Products [Member]
Revenue	369		380	891	1,084
Life Science Products [Member]
Revenue	220		250	707	744
All Other [Member]
Revenue	$ 99		$ 53	$ 218	$ 160