Deferred Policy Acquisition Costs (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Summary of deferred policy acquisition costs
Deferred policy acquisition costs	$ 1,127		$ 1,127		$ 1,244
Deferred Policy Acquisition Costs (Textuals) [Abstract]
Accumulated amortization of present value of future profits	190		190		174
Amortization of present value of future profits	5	6	16	22
Property and Casualty Insurance [Member]
Summary of deferred policy acquisition costs
Policy acquisition costs	330		330		324
Annuity and Supplemental Insurance [Member]
Summary of deferred policy acquisition costs
Policy acquisition costs	979		979		892
Policyholder sales inducements	205		205		204
Present value of future profits	148		148		164
Impact of unrealized gains and losses on securities	(535)		(535)		(340)
Deferred policy acquisition costs	$ 797		$ 797		$ 920