Schedule II (Details) - Condensed Income Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Statement of Income
Net investment income	$ 3,590	$ 2,922	$ 2,562
Net realized investment gains (losses)	(30)	(105)	(204)
Total revenues	46,423	41,364	36,884
Interest expense	392	376	351
Other	5,819	5,176	4,810
Total claims and expenses	40,243	37,993	33,530
Income before income taxes	6,180	3,371	3,354
Income tax expense (benefit)	1,181	380	512
Net income	4,999	2,991	2,842
Travelers [Member]
Condensed Statement of Income
Net investment income	92	92	30
Net realized investment gains (losses)	34	37	(51)
Total revenues	126	129	(21)
Interest expense	344	328	303
Other	3	(18)	13
Total claims and expenses	347	310	316
Income before income taxes	(221)	(181)	(337)
Income tax expense (benefit)	(88)	(58)	(99)
Loss before net income of subsidiaries	(133)	(123)	(238)
Net income of subsidiaries	5,132	3,114	3,080
Net income	$ 4,999	$ 2,991	$ 2,842