Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue	$ 2,561	$ 2,940	$ 4,952	$ 5,752
Net sales of reportable segments and All Other	2,588	2,986	5,117	5,836
Foreign Currency Gain (Loss) [Member]
Adjustment/Movements	27	46	60	84
Revenue Adjustments [Member]
Adjustment/Movements			105
Display Products [Member]
Revenue	744	820	1,377	1,615
Telecommunication Products [Member]
Revenue	887	1,090	1,678	2,154
Specialty Glass Products [Member]
Revenue	417	369	769	678
Environmental Substrate and Filter Products [Member]
Revenue	215	353	522	704
Life Science Products [Member]
Revenue	236	255	487	494
All Other [Member]
Revenue	$ 62	$ 53	$ 119	$ 107