Investments (Details 4) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Unrealized gain on:
Pre-tax	$ 885	$ 736
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(315)	(261)
Net	570	475
Fixed Maturity Securities [Member]
Unrealized gain on:
Pre-tax	1,083	838
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(384)	(295)
Net	699	543
Equity Securities [Member]
Unrealized gain on:
Pre-tax	230	232
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(81)	(82)
Net	149	150
Deferred Policy Acquisition Costs [Member]
Unrealized gain on:
Pre-tax	(434)	(340)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	152	118
Net	(282)	(222)
Annuity Benefits And Other Liabilities [Member]
Unrealized gain on:
Pre-tax	6	6
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(2)	(2)
Net	$ 4	$ 4