Deferred Policy Acquisition Costs (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of amortization of deferred policy acquisition costs
Amortization of deferred policy acquisition costs	$ 154	$ 150	$ 296	$ 295
Property and Casualty Insurance [Member]
Summary of amortization of deferred policy acquisition costs
Amortization of policy acquisition costs	111	108	212	208
Annuity and Supplemental Insurance [Member]
Summary of amortization of deferred policy acquisition costs
Amortization of policy acquisition costs	31	30	59	62
Amortization of deferred policyholder sales inducements	8	7	16	14
Amortization of present value of future profits	4	5	9	11
Amortization of deferred policy acquisition costs	$ 43	$ 42	$ 84	$ 87