RESERVE ROLLFORWARDS

12 Months Ended

Dec. 31, 2020

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

RESERVE ROLLFORWARDS

RESERVE ROLLFORWARDS

Valuation and Qualifying Accounts

(Dollars in millions)			Additions
	Balance at January 1, 2020		Charges (Credits) to Cost and Expense		Other Accounts		Deductions		Balance at December 31, 2020
Reserve for:
Credit losses	$	11	$	4	$	—	$	1	$	14
LIFO inventory	248		(22)		—		—		226
Non-environmental asset retirement obligations	48		2		1		—		51
Environmental contingencies	287		8		—		10		285
Deferred tax valuation allowance	453		(61)		1		—		393
	$	1,047	$	(69)	$	2	$	11	$	969

(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:
Credit losses	$	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:
Credit losses	$	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		81		(4)		—		487
	$	1,063	$	132	$	1	$	19	$	1,177