Deferred Policy Acquisition Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 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	$ 806	$ 818	$ 975	$ 550
Deferred policy acquisition costs and present value of future profits, additions	172	187	530	516
Deferred policy acquisition costs and present value of future profits, periodic amortization	175	162	498	494
Deferred policy acquisition costs and present value of future profits, change included in realized gains	2		3
Deferred policy acquisition costs and present value of future profits, foreign currency translation	(2)	(1)	(1)	(2)
Deferred policy acquisition costs and present value of future profits, change in unrealized	55	25	(151)	297
Deferred policy acquisition costs and present value of future profits, ending balance	858	867	858	867
Property and Casualty Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs, beginning balance	219	208	211	204
Deferred policy acquisition costs, additions	129	118	380	360
Deferred policy acquisition costs, periodic amortization	(127)	(119)	(371)	(356)
Deferred policy acquisition costs, foreign currency translation	(2)	(1)	(1)	(2)
Deferred policy acquisition costs, ending balance	219	206	219	206
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	918	797	875	787
Deferred policy acquisition costs, additions	42	65	144	148
Deferred policy acquisition costs, periodic amortization	(38)	(32)	(98)	(105)
Deferred policy acquisition costs, change included in realized gains	1		2
Deferred policy acquisition costs, ending balance	923	830	923	830
Movement in Deferred Sales Inducements [Roll Forward]
Deferred sales inducements, beginning balance	141	159	149	170
Deferred sales inducements, additions	1	4	6	8
Deferred sales inducements, periodic amortization	(7)	(8)	(20)	(23)
Deferred sales inducements, change included in realized gains	1		1
Deferred sales inducements, ending balance	136	155	136	155
Movement in Present Value of Future Insurance Profits [Roll Forward]
Present value of future profits, beginning balance	79	92	85	99
Present value of future profits, periodic amortization	(3)	(3)	(9)	(10)
Present value of future profits, ending balance	76	89	76	89
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	(551)	(438)	(345)	(710)
Unrealized investment gains (losses), change in unrealized	55	25	(151)	297
Unrealized investment gains (losses), ending balance	(496)	(413)	(496)	(413)
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	587	610	764	346
Deferred policy acquisition costs and present value of future profits, additions	43	69	150	156
Deferred policy acquisition costs and present value of future profits, periodic amortization	48	43	127	138
Deferred policy acquisition costs and present value of future profits, change included in realized gains	2		3
Deferred policy acquisition costs and present value of future profits, change in unrealized	55	25	(151)	297
Deferred policy acquisition costs and present value of future profits, ending balance	$ 639	$ 661	$ 639	$ 661