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RESERVE ROLLFORWARDS

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

RESERVE ROLLFORWARDS

RESERVE ROLLFORWARDS

Valuation and Qualifying Accounts



(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



(Dollars in millions)					Additions
	Balance at January 1, 2015				Charges (Credits) to Cost and Expense				Other Accounts				Deductions				Balance at December 31, 2015
Reserve for:
Doubtful accounts and returns	$	10			$	1			$	2			$	—			$	13
LIFO inventory	462				(166		)		—				—				296
Non-environmental asset retirement obligations	44				4				—				2				46
Environmental contingencies	345				9				11				29				336
Deferred tax valuation allowance	264				58				(18		)		50				254
	$	1,125			$	(94	)		$	(5	)		$	81			$	945