Schedule II (Details) - Condensed Income Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Statement of Income
Net investment income	$ 3,033	$ 2,227	$ 2,468
Net realized investment gains	171	2	113
Total revenues	34,816	31,981	31,581
Interest expense	340	339	344
Other	4,677	4,509	4,365
Total claims and expenses	30,358	28,744	28,443
Income before income taxes	4,458	3,237	3,138
Income tax expense (benefit)	796	540	516
Net income	3,662	2,697	2,622
Travelers [Member]
Condensed Statement of Income
Net investment income	13	19	41
Net realized investment gains	28	27	33
Total revenues	41	46	74
Interest expense	292	292	297
Other	13	18	21
Total claims and expenses	305	310	318
Income before income taxes	(264)	(264)	(244)
Income tax expense (benefit)	(59)	(61)	(77)
Loss before net income of subsidiaries	(205)	(203)	(167)
Net income of subsidiaries	3,867	2,900	2,789
Net income	$ 3,662	$ 2,697	$ 2,622