Reportable Segments - Schedule of Information Concerning Principal Geographic Areas (Details) - Operating Segments - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 16,408	$ 14,469	$ 13,580
Long-lived assets	20,525	18,613	20,135
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	6,760	5,172	4,439
Long-lived assets	10,242	8,617	8,698
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	236	256	317
Long-lived assets	86	83	95
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	109	127	84
Long-lived assets	216	203	211
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	7,105	5,555	4,840
Long-lived assets	10,544	8,903	9,004
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	682	688	667
Long-lived assets	26	125	388
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,032	1,019	855
Long-lived assets	1,322	1,281	1,515
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	4,971	4,694	4,439
Long-lived assets	4,422	4,291	4,575
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	420	486	418
Long-lived assets	2,806	2,671	3,092
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	541	424	620
Long-lived assets	83	88	88
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	7,646	7,311	6,999
Long-lived assets	8,659	8,456	9,658
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	463	494	535
Long-lived assets	419	400	464
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	949	926	998
Long-lived assets	881	827	956
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,412	1,420	1,533
Long-lived assets	1,300	1,227	1,420
All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	245	183	208
Long-lived assets	$ 22	$ 27	$ 53

CORNING INC /NY 10-K