Schedule II (details) - Condensed Income Statement - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Statement of Income
Net investment income										$ 2,379	$ 2,787	$ 2,716
Net realized investment gains	[1]									3	79	166
Total revenues		$ 6,674	$ 6,794	$ 6,706	$ 6,626	$ 6,783	$ 6,886	$ 6,785	$ 6,708	26,800	27,162	26,191
Interest expense										373	369	361
Expenses, other										4,079	3,952	3,757
Total claims and expenses		5,465	5,487	5,630	5,478	5,323	5,628	5,884	5,238	22,060	22,073	21,246
Income before income taxes		1,209	1,307	1,076	1,148	1,460	1,258	901	1,470	4,740	5,089	4,945
Income tax expense (benefit)		343	379	264	315	422	339	218	418	1,301	1,397	1,272
Net income		$ 866	$ 928	$ 812	$ 833	$ 1,038	$ 919	$ 683	$ 1,052	3,439	3,692	3,673
Other-than-temporary impairment losses recognized in net realized investment gains										(52)	(26)	(15)
Other-than-temporary impairment gains (losses) recognized in other comprehensive income										(2)	4	5
Travelers [Member]
Condensed Statement of Income
Net investment income										7	6	7
Net realized investment gains										1	3	2
Total revenues										8	9	9
Interest expense										325	321	308
Expenses, other										16	15	13
Total claims and expenses										341	336	321
Income before income taxes										(333)	(327)	(312)
Income tax expense (benefit)										(108)	(115)	(170)
Loss before net income of subsidiaries										(225)	(212)	(142)
Net income of subsidiaries										3,664	3,904	3,815
Net income										3,439	3,692	3,673
Other-than-temporary impairment losses recognized in net realized investment gains										0	0	0
Other-than-temporary impairment gains (losses) recognized in other comprehensive income										$ 0	$ 0	$ 0

[1] Total other-than-temporary impairment (OTTI) losses were $(54) million, $(22) million and $(10) million for the years ended December 31, 2015, 2014 and 2013, respectively. Of total OTTI, credit losses of $(52) million, $(26) million and $(15) million for the years ended December 31, 2015, 2014 and 2013, respectively, were recognized in net realized investment gains. In addition, unrealized gains (losses) from other changes in total OTTI of $(2) million, $4 million and $5 million for the years ended December 31, 2015, 2014 and 2013, respectively, were recognized in other comprehensive income (loss) as part of changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income.