Schedule II (Details) - Condensed Balance Sheet - USD ($) shares in Millions, $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Balance Sheet
Fixed maturities, at fair value	$ 77,810	$ 74,003
Equity securities, at fair value	893	484
Short-term securities	3,836	5,511
Total assets	120,466	116,764
Debt	7,290	6,550
Total liabilities	91,579	87,563
Common stock (1,750.0 shares authorized; 241.2 and 252.4 shares issued and outstanding)	24,154	23,743
Retained earnings	41,555	38,771
Accumulated other comprehensive income	1,193	2,502
Treasury stock, at cost (541.5 and 527.3 shares)	(38,015)	(35,815)
Total shareholders’ equity	28,887	29,201	$ 25,943
Total liabilities and shareholders’ equity	$ 120,466	$ 116,764
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	241.2	252.4
Common stock, shares outstanding (in shares)	241.2	252.4
Treasury stock, at cost (in shares)	541.5	527.3
Travelers [Member]
Condensed Balance Sheet
Fixed maturities, at fair value	$ 95	$ 94
Equity securities, at fair value	279	241
Short-term securities	1,479	1,646
Investment in subsidiaries	33,298	33,015
Other assets	704	330
Total assets	35,855	35,326
Debt	6,596	5,856
Other liabilities	366	262
Total liabilities	6,962	6,118
Common stock (1,750.0 shares authorized; 241.2 and 252.4 shares issued and outstanding)	24,154	23,743
Retained earnings	41,561	38,778
Accumulated other comprehensive income	1,193	2,502
Treasury stock, at cost (541.5 and 527.3 shares)	(38,015)	(35,815)
Total shareholders’ equity	28,893	29,208
Total liabilities and shareholders’ equity	$ 35,855	$ 35,326
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	241.2	252.4
Common stock, shares outstanding (in shares)	241.2	252.4
Treasury stock, at cost (in shares)	541.5	527.3