Segments of Operations (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Segment Reporting Information [Line Items]
Earnings before realized gains (losses) and income taxes	$ 142		$ 118
Realized gains on securities	19		57
Earnings before income taxes	161		175
Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	58		43
Investment and other income, net	54		56
Earnings before realized gains (losses) and income taxes	112		99
Annuity [Member]
Segment Reporting Information [Line Items]
Earnings before realized gains (losses) and income taxes	73		76
Run-off Long-term Care and Life [Member]
Segment Reporting Information [Line Items]
Earnings before realized gains (losses) and income taxes	(2)		(1)
Other [Member]
Segment Reporting Information [Line Items]
Earnings before realized gains (losses) and income taxes	(41)	[1]	(56)	[1]
Specialty Property and transportation [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	6		10
Specialty casualty [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	38		19
Specialty financial [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	10		13
Specialty Other [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	5		6
Other Lines [Member]
Segment Reporting Information [Line Items]
Property and casualty insurance underwriting	$ (1)		$ (5)

[1] Includes holding company expenses and earnings (losses) of managed investment entities attributable to noncontrolling interests (earnings of less than $1 million for the first three months of 2014 and losses of $11 million for the first three months of 2013).