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DERIVATIVE INSTRUMENTS - Maximum Potential Risk, Fair Value, Weighted-Average Years to Maturity, and Underlying Referenced Credit Obligation Type for Credit Default Swaps (Detail) (Corporate Bonds, USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Credit Derivatives [Line Items] |  |
Maximum potential risk | $ 337 | $ (355)
Estimated fair value | (54) | (65)
Less than one year |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 0 | 0
Estimated fair value | 0 | 0
One to three years |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 124 | (133)
Estimated fair value | 2 | 2
Three to five years |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 106 | (106)
Estimated fair value | (41) | (47)
Five to ten years |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 107 | (116)
Estimated fair value | (15) | (20)
A |  |
Credit Derivatives [Line Items] |  |
Credit Rating | A | A
Maximum potential risk | 124 | (133)
Estimated fair value | 2 | 2
A | Less than one year |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 0 | 0
Estimated fair value | 0 | 0
A | One to three years |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 124 | (133)
Estimated fair value | 2 | 2
A | Three to five years |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 0 | 0
Estimated fair value | 0 | 0
A | Five to ten years |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 0 | 0
Estimated fair value | 0 | 0
BB or Lower |  |
Credit Derivatives [Line Items] |  |
Credit Rating | BB or lower | BB or lower
Maximum potential risk | 213 | (222)
Estimated fair value | (56) | (67)
BB or Lower | Less than one year |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 0 | 0
Estimated fair value | 0 | 0
BB or Lower | One to three years |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 0 | 0
Estimated fair value | 0 | 0
BB or Lower | Three to five years |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 106 | (106)
Estimated fair value | (41) | (47)
BB or Lower | Five to ten years |  |
Credit Derivatives [Line Items] |  |
Maximum potential risk | 107 | (116)
Estimated fair value | $ (15) | $ (20)

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- Definition Fair value as of the balance sheet date of credit risk derivative assets, net of credit risk derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -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 Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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- Definition Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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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- Definition Maximum amount the entity would be obligated to pay on the credit risk derivatives upon occurrence of a credit event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44 -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 Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A, 15B, 15C, 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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