Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2019

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, 2019	Balance at ‎beginning ‎of period		Additions		Net ‎deductions ‎and other		Balance at ‎end ‎of period
Doubtful accounts and allowances	$	64	$	17			$	81
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 and allowances	$	60	$	4			$	64
Deferred tax valuation allowance	$	456	$	17	$	156	$	317

Year ended December 31, 2017	Balance at ‎beginning ‎of period		Additions		Net ‎deductions ‎and other		Balance at ‎end ‎of period
Doubtful accounts and allowances	$	59	$	1			$	60
Deferred tax valuation allowance	$	270	$	241	$	55	$	456
Reserves for accrued costs of business restructuring	$	5			$	5