Casualty, Environmental and Other Reserves (Tables)

3 Months Ended

Mar. 31, 2018

Casualty, Environmental and Other Reserves [Abstract]

Schedule of Casualty, Environmental and Other Reserves

Personal injury and environmental reserves are considered critical accounting estimates due to the need for significant management judgment. Casualty, environmental and other reserves are provided for in the consolidated balance sheets as shown in the table below.

	March 31, 2018						December 31, 2017
(Dollars in millions)	Current		Long-term		Total		Current		Long-term		Total
Casualty:
Personal Injury	$	42	$	120	$	162	$	43	$	125	$	168
Occupational	7		53		60		6		54		60
Total Casualty	49		173		222		49		179		228
Environmental	31		58		89		31		59		90
Other	26		27		53		28		28		56
Total	$	106	$	258	$	364	$	108	$	266	$	374