Schedule II (Details) - Condensed Income Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Statement of Income
Net investment income	$ 2,922	$ 2,562	$ 3,033
Net realized investment gains (losses)	(105)	(204)	171
Total revenues	41,364	36,884	34,816
Interest expense	376	351	340
Other	5,176	4,810	4,677
Total claims and expenses	37,993	33,530	30,358
Income before income taxes	3,371	3,354	4,458
Income tax expense (benefit)	380	512	796
Net income	2,991	2,842	3,662
Travelers [Member]
Condensed Statement of Income
Net investment income	92	30	13
Net realized investment gains (losses)	37	(51)	28
Total revenues	129	(21)	41
Interest expense	328	303	292
Other	(18)	13	13
Total claims and expenses	310	316	305
Income before income taxes	(181)	(337)	(264)
Income tax expense (benefit)	(58)	(99)	(59)
Loss before net income of subsidiaries	(123)	(238)	(205)
Net income of subsidiaries	3,114	3,080	3,867
Net income	$ 2,991	$ 2,842	$ 3,662