Deferred Policy Acquisition Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Deferred policy acquisition costs and present value of future profits, beginning balance	$ 975	$ 550
Deferred policy acquisition costs and present value of future profits, additions	178	155
Deferred policy acquisition costs and present value of future profits, periodic amortization	(158)	(158)
Deferred policy acquisition costs and present value of future profits, change included in realized gains		(1)
Deferred policy acquisition costs and present value of future profits, change in unrealized	(105)	19
Deferred policy acquisition costs and present value of future profits, ending balance	890	565
Property and Casualty Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs, beginning balance	211	204
Deferred policy acquisition costs, additions	124	119
Deferred policy acquisition costs, periodic amortization	(121)	(120)
Deferred policy acquisition costs, ending balance	214	203
Annuity and Run-off Long-term Care and Life [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs, beginning balance	875	787
Deferred policy acquisition costs, additions	50	34
Deferred policy acquisition costs, periodic amortization	(27)	(27)
Deferred policy acquisition costs, change included in realized gains		(1)
Deferred policy acquisition costs, ending balance	898	793
Movement in Deferred Sales Inducements [Roll Forward]
Deferred sales inducements, beginning balance	149	170
Deferred sales inducements, additions	4	2
Deferred sales inducements, periodic amortization	(7)	(7)
Deferred sales inducements, ending balance	146	165
Movement in Present Value of Future Insurance Profits [Roll Forward]
Present value of future profits, beginning balance	85	99
Present value of future profits, periodic amortization	(3)	(4)
Present value of future profits, ending balance	82	95
Movement in Unrealized Gains (Losses) Related to Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Unrealized investment gains (losses), beginning balance	(345)	(710)
Unrealized investment gains (losses), change in unrealized	(105)	19
Unrealized investment gains (losses), ending balance	(450)	(691)
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Deferred policy acquisition costs and present value of future profits, beginning balance	764	346
Deferred policy acquisition costs and present value of future profits, additions	54	36
Deferred policy acquisition costs and present value of future profits, periodic amortization	(37)	(38)
Deferred policy acquisition costs and present value of future profits, change included in realized gains		(1)
Deferred policy acquisition costs and present value of future profits, change in unrealized	(105)	19
Deferred policy acquisition costs and present value of future profits, ending balance	$ 676	$ 362