Schedule II (Details) - Condensed Balance Sheet - USD ($) shares in Millions, $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Balance Sheet
Fixed maturities, at fair value	$ 71,160	$ 77,810
Equity securities, at fair value	807	893
Short-term securities	3,470	3,836
Total assets	115,717	120,466
Debt	7,292	7,290
Total liabilities	94,157	91,579
Common stock (1,750.0 shares authorized; 232.1 and 241.2 shares issued and outstanding)	24,565	24,154
Retained earnings	43,516	41,555
Accumulated other comprehensive income (loss)	(6,445)	1,193
Treasury stock, at cost (553.5 and 541.5 shares)	(40,076)	(38,015)
Total shareholders’ equity	21,560	28,887	$ 29,201
Total liabilities and shareholders’ equity	$ 115,717	$ 120,466
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	232.1	241.2
Common stock, shares outstanding (in shares)	232.1	241.2
Treasury stock, at cost (in shares)	553.5	541.5
Travelers [Member]
Condensed Balance Sheet
Fixed maturities, at fair value	$ 112	$ 95
Equity securities, at fair value	234	279
Short-term securities	1,406	1,479
Investment in subsidiaries	26,098	33,298
Other assets	748	704
Total assets	28,598	35,855
Debt	6,597	6,596
Other liabilities	433	366
Total liabilities	7,030	6,962
Common stock (1,750.0 shares authorized; 232.1 and 241.2 shares issued and outstanding)	24,565	24,154
Retained earnings	43,524	41,561
Accumulated other comprehensive income (loss)	(6,445)	1,193
Treasury stock, at cost (553.5 and 541.5 shares)	(40,076)	(38,015)
Total shareholders’ equity	21,568	28,893
Total liabilities and shareholders’ equity	$ 28,598	$ 35,855
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	232.1	241.2
Common stock, shares outstanding (in shares)	232.1	241.2
Treasury stock, at cost (in shares)	553.5	541.5