Schedule II (Details) - Condensed Balance Sheet - USD ($) shares in Millions, $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Balance Sheet
Fixed maturities, at fair value	$ 83,666	$ 77,807
Equity securities, at fair value	687	608
Short-term securities	4,766	5,137
Total assets	133,189	125,978
Debt	8,033	8,031
Total liabilities	105,325	101,057
Common stock (1,750.0 shares authorized; 226.6 and 228.2 shares issued and outstanding)	25,452	24,906
Retained earnings	49,630	45,591
Accumulated other comprehensive loss	(4,967)	(4,471)
Treasury stock, at cost (564.3 and 559.2 shares)	(42,251)	(41,105)
Total shareholders’ equity	27,864	24,921	$ 21,560
Total liabilities and shareholders’ equity	$ 133,189	$ 125,978
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	226.6	228.2
Common stock, shares outstanding (in shares)	226.6	228.2
Treasury stock, at cost (in shares)	564.3	559.2
Travelers [Member]
Condensed Balance Sheet
Fixed maturities, at fair value	$ 186	$ 182
Equity securities, at fair value	284	241
Short-term securities	1,748	1,494
Investment in subsidiaries	32,374	29,946
Other assets	774	549
Total assets	35,366	32,412
Debt	7,337	7,336
Other liabilities	158	146
Total liabilities	7,495	7,482
Common stock (1,750.0 shares authorized; 226.6 and 228.2 shares issued and outstanding)	25,452	24,906
Retained earnings	49,637	45,600
Accumulated other comprehensive loss	(4,967)	(4,471)
Treasury stock, at cost (564.3 and 559.2 shares)	(42,251)	(41,105)
Total shareholders’ equity	27,871	24,930
Total liabilities and shareholders’ equity	$ 35,366	$ 32,412
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	226.6	228.2
Common stock, shares outstanding (in shares)	226.6	228.2
Treasury stock, at cost (in shares)	564.3	559.2