Casualty, Environmental and Other Reserves (Tables)

12 Months Ended

Dec. 31, 2022

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, 2019	$	187	$	74	$	44	$	305
Charged to Expense	55		20		32		107
Payments	(46)		(18)		(34)		(98)
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

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 2022						December 2021
(Dollars in Millions)	Current		Long-term		Total		Current		Long-term		Total
Casualty:
Personal Injury	$	40	$	86	$	126	$	37	$	81	$	118
Occupational	10		58		68		7		55		62
Total Casualty	$	50	$	144	$	194	$	44	$	136	$	180
Environmental	53		108		161		37		71		108
Other	41		40		81		37		43		80
Total	$	144	$	292	$	436	$	118	$	250	$	368