Consolidating Financial Statements (details) - Consolidating Statement of Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Consolidating Statement of Income
Premiums		$ 5,981	$ 5,888
Net investment income		544	592
Fee income		117	114
Net realized investment gains (losses)	[1]	(9)	10
Other revenues		53	25
Total revenues		6,686	6,629
Claims and claim adjustment expenses		3,712	3,431
Amortization of deferred acquisition costs		971	963
General and administrative expenses		995	995
Interest expense		91	92
Total claims and expenses		5,769	5,481
Income before income taxes		917	1,148
Income tax expense (benefit)		226	315
Net income		691	833
Total other-than-temporary impairment losses		(28)	(4)
Other-than-temporary impairment losses recognized in net realized investment gains (losses)		(18)	(3)
Other-than-temporary impairment losses recognized in other comprehensive income		(10)	(1)
TPC [Member]
Consolidating Statement of Income
Premiums		4,085	3,996
Net investment income		376	411
Fee income		117	114
Net realized investment gains (losses)		(16)	2
Other revenues		48	21
Total revenues		4,610	4,544
Claims and claim adjustment expenses		2,520	2,309
Amortization of deferred acquisition costs		650	642
General and administrative expenses		704	698
Interest expense		12	12
Total claims and expenses		3,886	3,661
Income before income taxes		724	883
Income tax expense (benefit)		199	251
Net income		525	632
Total other-than-temporary impairment losses		(14)	(1)
Other-than-temporary impairment losses recognized in net realized investment gains (losses)		(9)	(1)
Other-than-temporary impairment losses recognized in other comprehensive income		(5)
Other Subsidiaries [Member]
Consolidating Statement of Income
Premiums		1,896	1,892
Net investment income		166	180
Net realized investment gains (losses)		7	7
Other revenues		16	4
Total revenues		2,085	2,083
Claims and claim adjustment expenses		1,192	1,122
Amortization of deferred acquisition costs		321	321
General and administrative expenses		298	292
Total claims and expenses		1,811	1,735
Income before income taxes		274	348
Income tax expense (benefit)		69	93
Net income		205	255
Total other-than-temporary impairment losses		(14)	(3)
Other-than-temporary impairment losses recognized in net realized investment gains (losses)		(9)	(2)
Other-than-temporary impairment losses recognized in other comprehensive income		(5)	(1)
Travelers [Member]
Consolidating Statement of Income
Net investment income		2	1
Net realized investment gains (losses)			1
Total revenues		2	2
General and administrative expenses		4	5
Interest expense		79	80
Total claims and expenses		83	85
Income before income taxes		(81)	(83)
Income tax expense (benefit)		(42)	(29)
Net income of subsidiaries		730	887
Net income		691	833
Eliminations [Member]
Consolidating Statement of Income
Other revenues		(11)
Total revenues		(11)
General and administrative expenses		(11)
Total claims and expenses		(11)
Net income of subsidiaries		(730)	(887)
Net income		$ (730)	$ (887)

[1] Total other-than-temporary impairment (OTTI) losses were $(28) million and $(4) million for the three months ended March 31, 2016 and 2015, respectively. Of total OTTI, credit losses of $(18) million and $(3) million for the three months ended March 31, 2016 and 2015, respectively, were recognized in net realized investment gains (losses). In addition, unrealized losses from other changes in total OTTI of $(10) million and $(1) million for the three months ended March 31, 2016 and 2015, 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.