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INVESTMENTS - Pretax Other-Than-Temporary Impairment Losses by Investment Category (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Gain (Loss) on Investments [Line Items] |  |  |  |
Other-than-temporary impairment losses | $ 203 | [1] | $ 405 | [2]
Perpetual Securities |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Other-than-temporary impairment losses | 140 |  | 0 |
Corporate Bonds |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Other-than-temporary impairment losses | 63 |  | 397 |
Mortgage- and asset-backed Securities |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Other-than-temporary impairment losses | 0 |  | 6 |
Municipalities |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Other-than-temporary impairment losses | 0 |  | 1 |
Equity Securities |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Other-than-temporary impairment losses | 0 |  | 1 |
Credit Related Impairment [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Other-than-temporary impairment losses | 28 |  |  |
Change In Intent Impairment [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Other-than-temporary impairment losses | $ 175 |  |  |
[1] | Includes $28 for credit-related impairments and $175 from change in intent to sell securities
[2] | Consisted completely of credit-related impairments

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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. + Details
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