Fair Value Measurements (Details 4) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Bonds available for sale
Net realized and unrealized gains and losses related to Level 3 items
Net realized and unrealized gains (losses) included in net investment income, assets measured at Level 3	$ 159	$ 85	$ 240	$ 152
Net realized and unrealized gains (losses) included in net realized capital gains, assets measured at Level 3	(80)	(417)	(256)	(941)
Net realized and unrealized gains (losses) included in other income, assets measured at Level 3	4	1	8	9
Net realized and unrealized gains (losses) included in income, assets	83	(331)	(8)	(780)
Bond trading securities
Net realized and unrealized gains and losses related to Level 3 items
Net realized and unrealized gains (losses) included in net investment income, assets measured at Level 3	(496)	460	505	1,357
Net realized and unrealized gains (losses) included in other income, assets measured at Level 3	(355)	223	(286)	479
Net realized and unrealized gains (losses) included in income, assets	(851)	683	219	1,836
Equity securities available for sale
Net realized and unrealized gains and losses related to Level 3 items
Net realized and unrealized gains (losses) included in net realized capital gains, assets measured at Level 3	2	1	15	(6)
Net realized and unrealized gains (losses) included in income, assets	2	1	15	(6)
Equity securities trading
Net realized and unrealized gains and losses related to Level 3 items
Net realized and unrealized gains (losses) included in net investment income, assets measured at Level 3	1		1
Net realized and unrealized gains (losses) included in income, assets	1		1
Other invested assets
Net realized and unrealized gains and losses related to Level 3 items
Net realized and unrealized gains (losses) included in net investment income, assets measured at Level 3	(2)	192	44	248
Net realized and unrealized gains (losses) included in net realized capital gains, assets measured at Level 3	(37)	(50)	(52)	(248)
Net realized and unrealized gains (losses) included in other income, assets measured at Level 3	22	(29)	44	(15)
Net realized and unrealized gains (losses) included in income, assets	(17)	113	36	(15)
Policyholder contract deposits
Net realized and unrealized gains and losses related to Level 3 items
Net realized and unrealized gains (losses) included in net realized capital gains, liabilities measured at Level 3	(33)	(830)	46	(697)
Net realized and unrealized gains (losses) included in other income, liabilities measured at Level 3		40		40
Net realized and unrealized gains (losses) included in policyholder benefits and claims incurred, liabilities measured at Level 3		(30)		33
Net realized and unrealized gains (losses) included in income, liabilities	(33)	(820)	46	(624)
Derivative liabilities, net
Net realized and unrealized gains and losses related to Level 3 items
Net realized and unrealized gains (losses) included in net investment income, liabilities measured at Level 3	1		1
Net realized and unrealized gains (losses) included in net realized capital gains, liabilities measured at Level 3	7		(47)
Net realized and unrealized gains (losses) included in other income, liabilities measured at Level 3	184	535	504	825
Net realized and unrealized gains (losses) included in income, liabilities	192	535	458	825
Other long-term debt
Net realized and unrealized gains and losses related to Level 3 items
Net realized and unrealized gains (losses) included in other income, liabilities measured at Level 3	(157)	73	(211)	(62)
Net realized and unrealized gains (losses) included in income, liabilities	$ (157)	$ 73	$ (211)	$ (62)

Represents gains or losses for the period which are included in net investment income for assets measured on a recurring basis using significant unobservable inputs (Level 3).

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- Definition

Represents realized gains or losses for the period which are included in net realized capital gains or losses for assets measured on a recurring basis using significant unobservable inputs (Level 3).

+ Details

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- Definition

Represents realized gains or losses for the period which are included in other income for assets measured on a recurring basis using significant unobservable inputs (Level 3).

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- Definition

Represents realized gains or losses for the period which are included in other income for Liabilities measured on a recurring basis using significant unobservable inputs (Level 3).

+ Details

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- Definition

Represents gains or losses for the period which are included in net investment income for liabilities measured on a recurring basis using significant unobservable inputs (Level 3).

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Represents realized gains or losses for the period which are included in net realized capital gains or losses for liabilities measured on a recurring basis using significant unobservable inputs (Level 3).

+ Details

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- Definition

Represents realized gains or losses for the period which are included in policyholder benefits and claims incurred for liabilities measured on a recurring basis using significant unobservable inputs (Level 3).

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

+ Details

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