Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue	$ 2,391	$ 2,812
Net sales of reportable segments and All Other	2,529	2,850
Foreign Currency Gain (Loss) [Member]
Adjustment/Movements	33	38
Revenue Adjustments [Member]
Adjustment/Movements	105
Display Products [Member]
Revenue	633	795
Telecommunication Products [Member]
Revenue	791	1,064
Specialty Glass Products [Member]
Revenue	352	309
Environmental Substrate and Filter Products [Member]
Revenue	307	351
Life Science Products [Member]
Revenue	251	239
All Other [Member]
Revenue	$ 57	$ 54