Investments (Details 4) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Gross Realized Gains	$ 705,000,000	$ 277,000,000	$ 998,000,000	$ 863,000,000
Gross Realized Losses	44,000,000	78,000,000	101,000,000	127,000,000
Aggregate fair value of available for sale securities sold	12,600,000,000		24,100,000,000
Net realized capital gains	661,000,000		897,000,000
Fixed maturity securities
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Gross Realized Gains	662,000,000	189,000,000	850,000,000	570,000,000
Gross Realized Losses	38,000,000	55,000,000	93,000,000	97,000,000
Equity securities
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Gross Realized Gains	43,000,000	88,000,000	148,000,000	293,000,000
Gross Realized Losses	$ 6,000,000	$ 23,000,000	$ 8,000,000	$ 30,000,000

This item represents the realized capital gain (loss) on the sale of available for sale securities categorized neither as held-to-maturity nor trading securities during the period.

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- Definition

This element represents the aggregate fair value of Available-for-sale securities sold during the reporting period.

+ Details

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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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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