Segments of Operations (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Segment Reporting Information [Line Items]
Earnings before realized gains (losses) and income taxes	$ 85		$ 121		$ 203		$ 223
Realized gains on securities	41		16		98		60
Realized losses on subsidiaries	0		(1)		0		(1)
Earnings before income taxes	126		136		301		282
Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	19		45		62		93
Investment and other income, net	60		60		116		115
Earnings before realized gains (losses) and income taxes	79		105		178		208
Annuity [Member]
Segment Reporting Information [Line Items]
Earnings before realized gains (losses) and income taxes	77	[1]	59		153	[1]	119
Run-off Long-term Care and Life [Member]
Segment Reporting Information [Line Items]
Earnings before realized gains (losses) and income taxes	(2)		5		(3)		6
Medicare Supplement and Critical Illness [Member]
Segment Reporting Information [Line Items]
Earnings before realized gains (losses) and income taxes	0	[2]	12	[2]		[2]	18	[2]
Other [Member]
Segment Reporting Information [Line Items]
Earnings before realized gains (losses) and income taxes	(69)	[3]	(60)	[3]	(125)	[3]	(128)	[3]
Specialty Property and transportation [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	(31)		6		(21)		33
Specialty casualty [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	32		33		51		37
Specialty financial [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	15		11		28		27
Specialty Other [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	5		2		11		3
Other Lines [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	$ (2)		$ (7)		$ (7)		$ (7)

[1] Includes a $5 million charge in the second quarter of 2013 to cover expected assessments from state guaranty funds related to the insolvency and liquidation of an unaffiliated life insurance company.

[2] Sold in August 2012.

[3] Includes holding company expenses and losses of managed investment entities attributable to noncontrolling interest of $31 million and $18 million for the second quarter and $42 million and $46 million for the first six months of 2013 and 2012, respectively.