Casualty, Environmental and Other Reserves (Tables)

12 Months Ended

Dec. 31, 2025

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, 2022	$	194	$	161	$	81	$	436
Charged to Expense	69		29		67		165
Payments	(68)		(36)		(57)		(161)
December 31, 2023	195		154		91		440
Charged to Expense	72		28		68		168
Payments	(59)		(31)		(56)		(146)
December 31, 2024	208		151		103		462
Charged to Expense	67		32		100		199
Payments	(62)		(27)		(93)		(182)
December 31, 2025	$	213	$	156	$	110	$	479

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 2025						December 2024
(Dollars in Millions)	Current		Long-term		Total		Current		Long-term		Total
Casualty:
Personal Injury	$	60	$	94	$	154	$	51	$	91	$	142
Occupational	6		53		59		7		59		66
Total Casualty	$	66	$	147	$	213	$	58	$	150	$	208
Environmental	49		107		156		37		114		151
Other	69		41		110		54		49		103
Total	$	184	$	295	$	479	$	149	$	313	$	462