Note 3 - Investments - Results From Operations (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net sales		$ 14,082	$ 11,303	$ 11,503
Gross profit		5,063	3,531	4,035
Net income (loss) attributable to the affiliated companies		1,935	523	979
Corning’s equity in earnings (losses) of affiliated companies		35	(25)	17
Dividends received from affiliated companies		8	1	106
Current assets		7,659	8,004
Short-term borrowings, including current portion of long-term debt		55	156
Other long-term liabilities		5,192	5,017
Non-controlling interest		212	191
Intercompany receivables and payables within HSG (included in current assets and other current liabilities)			8
Affiliated Companies [Member]
Net sales	[1]	816	1,201	1,508
Gross profit	[1]	104	136	79
Net income (loss)	[1]	113	(48)	(102)
Net income (loss) attributable to the affiliated companies	[1]	114	(15)	70
Corning’s equity in earnings (losses) of affiliated companies	[1]	35	(25)	17
Corning sales to affiliated companies		312	253	277
Corning purchases from affiliated companies		12	8	12
Corning transfers of assets, at cost, to affiliated companies		1	9	8
Dividends received from affiliated companies		6	1	106
Current assets		648	534
Noncurrent assets		549	466
Short-term borrowings, including current portion of long-term debt		6	2
Other current liabilities		159	164
Long-term debt		58	60
Other long-term liabilities		66	11
Balances due from affiliated companies		38	36
Balances due to affiliated companies		1	1
HSG [Member]
Net sales			423	779
Gross profit			87	9
Net income (loss)	[2]		11	(117)
Net income (loss) attributable to the affiliated companies			44	54
Corning’s equity in earnings (losses) of affiliated companies			22	27
Corning sales to affiliated companies			55	112
Dividends received from affiliated companies				$ 100
Current assets			853
Noncurrent assets			725
Short-term borrowings, including current portion of long-term debt			178
Other current liabilities			337
Long-term debt			6
Other long-term liabilities			1,499
Non-controlling interest			$ 9

[1] The year ended December 31, 2020, only include HSG's results of operations through September 8, 2020. Immediately following the Redemption, Corning began consolidating HSG on September 9, 2020.

[2] HSG's net income for the period ended September 8, 2020, included a pre-tax gain recorded in the second quarter of 2020, related to the settlement of a long-term supply agreement of approximately $165 million, partially offset by an inventory provision of approximately $44 million associated with the settlement of the agreement. Prior to the Redemption, in the third quarter of 2020, HSG recorded a pre-tax loss of $200 million resulting from the TCS Settlement, of which Corning’s share of the pre-tax loss was $81 million. Accordingly, Corning’s share of the net impact was an equity loss of $19 million.