Consolidating Financial Statements (details) - Consolidating Statement of Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Consolidating Statement of Income
Premiums	$ 5,823		$ 5,517
Net investment income	736		670
Fee income	107		97
Net realized investment gains (losses)	1	[1]	10	[1]
Other revenues	41		34
Total revenues	6,708		6,328
Claims and claim adjustment expenses	3,315		3,153
Amortization of deferred acquisition costs	950		948
General and administrative expenses	881		915
Interest expense	92		92
Total claims and expenses	5,238		5,108
Income before income taxes	1,470		1,220
Income tax expense (benefit)	418		324
Net income	1,052		896
Total other-than-temporary impairment gains (losses)	(7)		0
Other-than-temporary impairment losses recognized in net realized investment gains (losses)	(9)		(5)
Other-than-temporary impairment gains recognized in other comprehensive income	2		5
Reportable Legal Entities [Member] | TPC [Member]
Consolidating Statement of Income
Premiums	3,944		3,741
Net investment income	500		455
Fee income	107		96
Net realized investment gains (losses)	1		(7)
Other revenues	33		29
Total revenues	4,585		4,314
Claims and claim adjustment expenses	2,221		2,131
Amortization of deferred acquisition costs	635		637
General and administrative expenses	613		630
Interest expense	12		17
Total claims and expenses	3,481		3,415
Income before income taxes	1,104		899
Income tax expense (benefit)	321		249
Net income	783		650
Total other-than-temporary impairment gains (losses)	(2)		(3)
Other-than-temporary impairment losses recognized in net realized investment gains (losses)	(4)		(4)
Other-than-temporary impairment gains recognized in other comprehensive income	2		1
Reportable Legal Entities [Member] | Other Subsidiaries [Member]
Consolidating Statement of Income
Premiums	1,879		1,776
Net investment income	235		213
Fee income			1
Net realized investment gains (losses)	(2)		16
Other revenues	8		5
Total revenues	2,120		2,011
Claims and claim adjustment expenses	1,094		1,022
Amortization of deferred acquisition costs	315		311
General and administrative expenses	265		286
Total claims and expenses	1,674		1,619
Income before income taxes	446		392
Income tax expense (benefit)	125		99
Net income	321		293
Total other-than-temporary impairment gains (losses)	(5)		3
Other-than-temporary impairment losses recognized in net realized investment gains (losses)	(5)		(1)
Other-than-temporary impairment gains recognized in other comprehensive income			4
Reportable Legal Entities [Member] | Travelers [Member]
Consolidating Statement of Income
Net investment income	1		2
Net realized investment gains (losses)	2		1
Total revenues	3		3
General and administrative expenses	3		(1)
Interest expense	80		75
Total claims and expenses	83		74
Income before income taxes	(80)		(71)
Income tax expense (benefit)	(28)		(24)
Net income of subsidiaries	1,104		943
Net income	1,052		896
Eliminations [Member]
Consolidating Statement of Income
Net income of subsidiaries	(1,104)		(943)
Net income	$ (1,104)		$ (943)

[1] Total other-than-temporary impairment (OTTI) gains (losses) were $(7) million for the three months ended March 31, 2014 and $0 million for the three months ended March 31, 2013. Of total OTTI, credit losses of $(9) million and $(5) million for the three months ended March 31, 2014 and 2013, respectively, were recognized in net realized investment gains. In addition, unrealized gains from other changes in total OTTI of $2 million and $5 million for the three months ended March 31, 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.