Deferred Policy Acquisition Costs (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Item Effected [Line Items]
Deferred policy acquisition costs	$ 1,105	$ 1,244
Deferred Policy Acquisition Costs (Textual) [Abstract]
Deferred policyholder sales inducements capitalized	20	33	32
Amortization of deferred policyholder sales inducements	21	36	20
Accumulated amortization of present value of future profits	195	174
Amortization of present value of future profits	20	26	29
Decrease in present value of future profits during next five years	approximately one-sixth
Annuity and Supplemental Insurance [Member]
Item Effected [Line Items]
Deferred policy acquisition costs	774	920
As adjusted [Member]
Item Effected [Line Items]
Deferred policy acquisition costs	901	1,031
As adjusted [Member] | Property and Casualty Insurance [Member]
Item Effected [Line Items]
Deferred policy acquisition costs	189
As adjusted [Member] | Annuity and Supplemental Insurance [Member]
Item Effected [Line Items]
Deferred policy acquisition costs	$ 712