Schedule II - Valuation Accounts and Reserves

12 Months Ended

Dec. 31, 2018

Valuation Accounts and Reserves [Abstract]

Schedule II - Valuation Accounts and Reserves

Corning Incorporated and Subsidiary Companies

Schedule II – Valuation and Qualifying Accounts

(in millions)

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

Year ended December 31, 2016	Balance at beginning of period		Additions		Net deductions and other		Balance at end of period
Doubtful accounts and allowances	$	48	$	11			$	59
Deferred tax valuation allowance	$	238	$	55	$	23	$	270
Reserves for accrued costs of business restructuring	$	3	$	15	$	13	$	5