Casualty, Environmental and Other Reserves (Tables)

12 Months Ended

Dec. 31, 2018

Casualty, Environmental and Other Reserves [Abstract]

Schedule of Claims Activity

Activity related to casualty, environmental and other reserves is as follows:

	Casualty			Environmental			Other
(Dollars in Millions)	Reserves			Reserves			Reserves			Total
December 25, 2015	$	269		$	82		$	49		$	400
Charged to Expense	52			46			30			128
Change in Estimate(a)	(28		)	—			—			(28		)
Payments	(64		)	(33		)	(29		)	(126		)
December 30, 2016	229			95			50			374
Charged to Expense	43			26			45			114
Payments	(44		)	(31		)	(39		)	(114		)
December 31, 2017	228			90			56			374
Charged to Expense	47			10			41			98
Change in Estimate(a)	(26		)	—			—			(26		)
Payments	(50		)	(20		)	(52		)	(122		)
December 31, 2018	$	199		$	80		$	45		$	324

^(a)  Changes in estimates are the result of continued safety improvements and a continuing decline in the severity of injuries.

Schedule of Balance Sheet Presentation of Casualty, Environmental and Other Reserves

Casualty, environmental and other reserves are provided for in the consolidated balance sheets as shown in the table below.

	December 2018						December 2017
(Dollars in Millions)	Current		Long-term		Total		Current		Long-term		Total
Casualty:
Personal Injury	$	40	$	103	$	143	$	43	$	125	$	168
Occupational	10		46		56		6		54		60
Total Casualty	$	50	$	149	$	199	$	49	$	179	$	228
Environmental	39		41		80		31		59		90
Other	24		21		45		28		28		56
Total	$	113	$	211	$	324	$	108	$	266	$	374