Casualty, Environmental and Other Reserves (Tables)

12 Months Ended

Dec. 31, 2023

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 31, 2020	$	196	$	76	$	42	$	314
Assumed in Acquisition of Quality Carriers	—		29		33		62
Charged to Expense	55		26		49		130
Payments	(71)		(23)		(44)		(138)
December 31, 2021	180		108		80		368
Assumed in Acquisition of Pan Am	19		36		—		55
Charged to Expense	45		47		51		143
Payments	(50)		(30)		(50)		(130)
December 31, 2022	194		161		81		436
Charged to Expense	69		29		67		165
Payments	(68)		(36)		(57)		(161)
December 31, 2023	$	195	$	154	$	91	$	440

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 2023						December 2022
(Dollars in Millions)	Current		Long-term		Total		Current		Long-term		Total
Casualty:
Personal Injury	$	45	$	83	$	128	$	40	$	86	$	126
Occupational	7		60		67		10		58		68
Total Casualty	$	52	$	143	$	195	$	50	$	144	$	194
Environmental	41		113		154		53		108		161
Other	51		40		91		41		40		81
Total	$	144	$	296	$	440	$	144	$	292	$	436