Note 9 - Investments (Details) - Results of Operations - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement of Operations:
Corning’s equity in earnings of Dow Corning		$ 59	$ 94
Dow Corning Corporation [Member]
Statement of Operations:
Net sales		1,316	1,364
Gross profit (1)	[1]	350	358
Net income attributable to Dow Corning		112	185
Corning’s equity in earnings of Dow Corning		$ 56	$ 92

[1] Gross profit for the three months ended March 31, 2016 includes research and development costs of $57 million (2015: $62 million).