Schedule II (details) - Condensed Balance Sheet - USD ($) shares in Millions, $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Balance Sheet
Fixed maturities, at fair value	$ 60,658	$ 63,474
Equity securities	705	899
Short-term securities	4,671	4,364
Total assets	100,184	103,078
Debt	6,344	6,349
Total liabilities	76,586	78,242
Common stock (1,750.0 shares authorized; 295.9 and 322.2 shares issued and outstanding)	22,172	21,843
Retained earnings	29,945	27,251
Accumulated other comprehensive income (loss)	(157)	880
Treasury stock, at cost (467.6 and 437.3 shares)	(28,362)	(25,138)
Total shareholders' equity	23,598	24,836	$ 24,796
Total liabilities and shareholders' equity	$ 100,184	$ 103,078
Common stock, shares authorized	1,750.0	1,750.0
Common stock, shares issued	295.9	322.2
Common stock, shares outstanding	295.9	322.2
Treasury stock, at cost, shares	467.6	437.3
Travelers [Member]
Condensed Balance Sheet
Fixed maturities, at fair value	$ 46	$ 30
Equity securities	141	141
Short-term securities	1,546	1,530
Investment in subsidiaries	27,573	28,821
Other assets	58	72
Total assets	29,364	30,594
Debt	5,651	5,657
Other liabilities	127	114
Total liabilities	5,778	5,771
Common stock (1,750.0 shares authorized; 295.9 and 322.2 shares issued and outstanding)	22,172	21,843
Retained earnings	29,933	27,238
Accumulated other comprehensive income (loss)	(157)	880
Treasury stock, at cost (467.6 and 437.3 shares)	(28,362)	(25,138)
Total shareholders' equity	23,586	24,823
Total liabilities and shareholders' equity	$ 29,364	$ 30,594
Common stock, shares authorized	1,750.0	1,750.0
Common stock, shares issued	295.9	322.2
Common stock, shares outstanding	295.9	322.2
Treasury stock, at cost, shares	467.6	437.3