Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table presents the changes in goodwill:

	General Insurance
(in millions)	North America Commercial		International Commercial		Global Personal		Other Operations		Total
Balance at January 1, 2024:
Goodwill - gross	$	4,285	$	2,028	$	502	$	17	$	6,832
Accumulated impairments	(2,216)		(947)		(237)		(10)		(3,410)
Net goodwill	2,069		1,081		265		7		3,422
Increase (decrease) due to:
Dispositions	—		—		(22)		—		(22)
Foreign exchange and other	—		(25)		(2)		—		(27)
Balance at December 31, 2024:
Goodwill - gross	4,285		2,003		478		17		6,783
Accumulated impairments	(2,216)		(947)		(237)		(10)		(3,410)
Net goodwill	2,069		1,056		241		7		3,373
Increase (decrease) due to:
Foreign exchange and other	—		58		4		—		62
Balance at December 31, 2025:
Goodwill - gross	4,285		2,061		482		17		6,845
Accumulated impairments	(2,216)		(947)		(237)		(10)		(3,410)
Net goodwill	$	2,069	$	1,114	$	245	$	7	$	3,435