Schedule II (Details) - Condensed Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Statement of Comprehensive Income
Net income	$ 2,842	$ 3,662	$ 2,697
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income	(9,276)	(2,115)	2,331
Net changes in benefit plan assets and obligations	(87)	455	18
Other comprehensive income (loss) before income taxes	(9,640)	(1,671)	2,352
Income tax expense (benefit)	(2,002)	(362)	490
Other comprehensive income (loss), net of taxes	(7,638)	(1,309)	1,862
Comprehensive income (loss)	(4,796)	2,353	4,559
Travelers [Member]
Condensed Statement of Comprehensive Income
Net income	2,842	3,662	2,697
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income	(12)	(4)	3
Net changes in benefit plan assets and obligations	(105)	444	25
Other comprehensive income (loss) before income taxes	(117)	440	28
Income tax expense (benefit)	(38)	87	9
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries	(79)	353	19
Other comprehensive income (loss) of subsidiaries	(7,559)	(1,662)	1,843
Other comprehensive income (loss), net of taxes	(7,638)	(1,309)	1,862
Comprehensive income (loss)	$ (4,796)	$ 2,353	$ 4,559