Investments (Results From Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales	$ 11,503	$ 11,290	$ 10,116
Corning’s equity in earnings of affiliated companies	17	390	361
Dividends received from affiliated companies	106	241	201
Affiliated Companies [Member]
Net sales	1,508	1,759	2,346
Gross profit	79	424	560
Net income (loss)	(102)	835	750
Net income attributable to the affiliated companies	70	798	721
Corning sales to affiliated companies	277	184	108
Corning’s equity in earnings of affiliated companies	17	390	361
Corning purchases from affiliated companies	12	11	12
Corning transfers of assets, at cost, to affiliated companies	8	2	22
Dividends received from affiliated companies	106	241	201
Current assets	1,566	1,716
Noncurrent assets	943	1,922
Short-term borrowings, including current portion of long-term debt	4	8
Other current liabilities	632	810
Long-term debt	68	14
Other long-term liabilities	1,522	1,708
Non-controlling interest	42	259
Balances due from affiliated companies	42	95
Balances due to affiliated companies	4
HSG [Member]
Net sales	779	1,158	1,716
Gross profit	9	367	469
Net income (loss)	(117)	814	746
Net income attributable to the affiliated companies	54	776	706
Corning sales to affiliated companies	112	206	312
Corning’s equity in earnings of affiliated companies	27	388	352
Dividends received from affiliated companies	100	241	$ 196
Current assets	1,011	1,188
Noncurrent assets	420	1,414
Short-term borrowings, including current portion of long-term debt	3	3
Other current liabilities	412	540
Long-term debt	8	11
Other long-term liabilities	1,507	1,708
Non-controlling interest	42	259
Intercompany receivables and payables within HSG (included in current assets and other current liabilities)	$ 15	$ 39