Casualty, Environmental and Other Reserves (Tables)

12 Months Ended

Dec. 31, 2017

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 26, 2014	$	265		$	94		$	59		$	418
Charged to Expense	60			45			37			142
Payments	(56		)	(57		)	(47		)	(160		)
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

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

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 2017						December 2016
(Dollars in Millions)	Current		Long-term		Total		Current		Long-term		Total
Casualty:
Personal Injury	$	43	$	125	$	168	$	46	$	124	$	170
Occupational	6		54		60		7		52		59
Total Casualty	$	49	$	179	$	228	$	53	$	176	$	229
Environmental	31		59		90		42		53		95
Other	28		28		56		20		30		50
Total	$	108	$	266	$	374	$	115	$	259	$	374