Deferred Policy Acquisition Costs (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Summary of deferred policy acquisition costs
Deferred policy acquisition costs	$ 1,198		$ 1,198		$ 1,244
Deferred Policy Acquisition Costs (Textuals) [Abstract]
Accumulated amortization of present value of future profits	185		185		174
Amortization of present value of future profits	5	10	11	16
Property and Casualty Insurance [Member]
Summary of deferred policy acquisition costs
Policy acquisition costs	331		331		324
Annuity and Supplemental Insurance [Member]
Summary of deferred policy acquisition costs
Policy acquisition costs	940		940		892
Policyholder sales inducements	208		208		204
Present value of future profits	153		153		164
Impact of unrealized gains and losses on securities	(434)		(434)		(340)
Deferred policy acquisition costs	$ 867		$ 867		$ 920