Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2020

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

Corning Incorporated and Subsidiary Companies

Schedule II – Valuation and Qualifying Accounts

(in millions)

Year ended December 31, 2020	Balance at ‎beginning ‎of period		Additions		Net ‎deductions ‎and other		Balance at ‎end ‎of period
Doubtful accounts	$	41	$	5			$	46
Deferred tax valuation allowance	$	215	$	27	$	75	$	167

Year ended December 31, 2019	Balance at ‎beginning ‎of period		Additions		Net ‎deductions ‎and other		Balance at ‎end ‎of period
Doubtful accounts	$	35	$	6			$	41
Deferred tax valuation allowance	$	317	$	10	$	112	$	215

Year ended December 31, 2018	Balance at ‎beginning ‎of period		Additions		Net ‎deductions ‎and other		Balance at ‎end ‎of period
Doubtful accounts	$	32	$	3			$	35
Deferred tax valuation allowance	$	456	$	17	$	156	$	317