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Note 5 - Earnings Per Common Share - Reconciliation of Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net income attributable to Corning Incorporated $ 208 $ 371 $ 1,352 $ 1,419
Less: Series A convertible preferred stock dividend     24
Less: Excess consideration paid for redemption of preferred shares [1]     803
Net income available to common shareholders 208 371 1,352 592
Net income available to common shareholders – diluted $ 208 $ 371 $ 1,352 $ 592
Weighted-average common shares outstanding – basic (in shares) 843 852 843 821
Employee stock options and other dilutive securities (in shares) 12 14 14 16
Weighted-average common shares outstanding – diluted (in shares) 855 866 857 837
Basic (Note 5) (in dollars per share) $ 0.25 $ 0.44 $ 1.60 $ 0.72
Diluted (Note 5) (in dollars per share) $ 0.24 $ 0.43 $ 1.58 $ 0.71
Total (in shares) 3 0 2 41
Share-Based Payment Arrangement [Member]        
Total (in shares) 3   2  
Series A Convertible Preferred Stock [Member]        
Series A convertible preferred stock (1) (in shares) [2]       41
[1] Refer to Note 4 (Earnings (Loss) per Common Share) and Note 12 (Shareholders' Equity) to the consolidated financial statements for additional information.
[2] For the nine months ended September 30, 2021, the Preferred Stock was anti-dilutive; therefore, it was excluded from the calculation of diluted earnings per share.