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RESERVE ROLLFORWARDS (Tables)

12 Months Ended

Dec. 31, 2018

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, 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	410				60				(4		)		—				466
	$	1,063			$	111			$	1			$	19			$	1,156



(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



(Dollars in millions)					Additions
	Balance at January 1, 2016				Charges (Credits) to Cost and Expense				Other Accounts				Deductions				Balance at December 31, 2016
Reserve for:
Doubtful accounts and returns	$	13			$	(2	)		$	—			$	1			$	10
LIFO inventory	296				(32		)		—				—				264
Non-environmental asset retirement obligations	46				—				—				—				46
Environmental contingencies	336				10				1				26				321
Deferred tax valuation allowance	254				20				4				—				278
	$	945			$	(4	)		$	5			$	27			$	919