RESERVE ROLLFORWARDS (Tables)

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts

Valuation and Qualifying Accounts



(Dollars in millions)			Additions
	Balance at January 1, 2019		Charges (Credits) to Cost and Expense			Other Accounts			Deductions		Balance at December 31, 2019
Reserve for:
Doubtful accounts and returns	$	11	$	—		$	—		$	—	$	11
LIFO inventory	337		(89		)	—			—		248
Non-environmental asset retirement obligations	46		2			—			—		48
Environmental contingencies	296		7			—			16		287
Deferred tax valuation allowance	487		(20		)	(14		)	—		453
	$	1,177	$	(100	)	$	(14	)	$	16	$	1,047



(Dollars in millions)			Additions
	Balance at January 1, 2018		Charges (Credits) to Cost and Expense			Other Accounts			Deductions		Balance at December 31, 2018
Reserve for:
Doubtful accounts and returns	$	12	$	—		$	—		$	1	$	11
LIFO inventory	288		44			5			—		337
Non-environmental asset retirement obligations	49		(2		)	—			1		46
Environmental contingencies	304		9			—			17		296
Deferred tax valuation allowance ⁽¹⁾	410		81			(4		)	—		487
	$	1,063	$	132		$	1		$	19	$	1,177



(Dollars in millions)			Additions
	Balance at January 1, 2017		Charges (Credits) to Cost and Expense		Other Accounts		Deductions		Balance at December 31, 2017
Reserve for:
Doubtful accounts and returns	$	10	$	3	$	—	$	1	$	12
LIFO inventory	264		24		—		—		288
Non-environmental asset retirement obligations	46		2		1		—		49
Environmental contingencies	321		8		4		29		304
Deferred tax valuation allowance	278		126		6		—		410
	$	919	$	163	$	11	$	30	$	1,063

⁽¹⁾

Revised from Note 21, "Reserve Rollforwards", to the Company's 2018 Annual Report on Form 10-K, which reported deferred tax valuation allowance as $466 million.