Investments (Details 4) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Unrealized gain on:
Pre-tax	$ 882	$ 736
Deferred Tax Amounts Attributable to Noncontrolling Interests	(316)	(261)
Net	566	475
Fixed Maturity Securities [Member]
Unrealized gain on:
Pre-tax	1,255	838
Deferred Tax Amounts Attributable to Noncontrolling Interests	(447)	(295)
Net	808	543
Equity Securities [Member]
Unrealized gain on:
Pre-tax	155	232
Deferred Tax Amounts Attributable to Noncontrolling Interests	(54)	(82)
Net	101	150
Deferred Policy Acquisition Costs [Member]
Unrealized gain on:
Pre-tax	(535)	(340)
Deferred Tax Amounts Attributable to Noncontrolling Interests	187	118
Net	(348)	(222)
Annuity Benefits And Other Liabilities [Member]
Unrealized gain on:
Pre-tax	7	6
Deferred Tax Amounts Attributable to Noncontrolling Interests	(2)	(2)
Net	$ 5	$ 4