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FAIR VALUE MEASUREMENTS - Changes in Available-For-Sale Investments and Derivatives Classified as Level 3 (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | $ 346 |  | $ 3,197 |
Realized investment gains (losses) included in earnings | (9) |  | 2 |
Unrealized gains (losses) included in other comprehensive income (loss) | (99) |  | (49) |
Purchases | 0 |  | 0 |
Issuances | 0 |  | 0 |
Sales | 0 |  | (400) |
Settlements | 21 |  | (3) |
Transfers into Level 3 | 0 |  | 125 | [1]
Transfers out of Level 3 | 0 |  | (2,616) | [2]
Balance, end of period | 259 |  | 256 |
Change in unrealized gains (losses) still held | (9) |  | 2 |
Fixed Maturities | Mortgage- and asset-backed Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 369 |  | 338 |
Realized investment gains (losses) included in earnings | 0 |  | 0 |
Unrealized gains (losses) included in other comprehensive income (loss) | (104) |  | (21) |
Purchases | 0 |  | 0 |
Issuances | 0 |  | 0 |
Sales | 0 |  | 0 |
Settlements | (3) |  | (3) |
Transfers into Level 3 | 0 |  | 125 | [1]
Transfers out of Level 3 | 0 |  | 0 | [2]
Balance, end of period | 262 |  | 439 |
Change in unrealized gains (losses) still held | 0 |  | 0 |
Fixed Maturities | Public Utilities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 0 |  | 420 |
Realized investment gains (losses) included in earnings | 0 |  | 0 |
Unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | (20) |
Purchases | 0 |  | 0 |
Issuances | 0 |  | 0 |
Sales | 0 |  | (400) |
Settlements | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 0 | [1]
Transfers out of Level 3 | 0 |  | 0 | [2]
Balance, end of period | 0 |  | 0 |
Change in unrealized gains (losses) still held | 0 |  | 0 |
Fixed Maturities | Sovereign and Supranational |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 0 |  | 418 |
Realized investment gains (losses) included in earnings | 0 |  | 0 |
Unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 |
Purchases | 0 |  | 0 |
Issuances | 0 |  | 0 |
Sales | 0 |  | 0 |
Settlements | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 0 | [1]
Transfers out of Level 3 | 0 |  | (418) | [2]
Balance, end of period | 0 |  | 0 |
Change in unrealized gains (losses) still held | 0 |  | 0 |
Fixed Maturities | Banks/financial Institutions |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 23 |  | 1,024 |
Realized investment gains (losses) included in earnings | 0 |  | 0 |
Unrealized gains (losses) included in other comprehensive income (loss) | 2 |  | (1) |
Purchases | 0 |  | 0 |
Issuances | 0 |  | 0 |
Sales | 0 |  | 0 |
Settlements | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 0 | [1]
Transfers out of Level 3 | 0 |  | (997) | [2]
Balance, end of period | 25 |  | 26 |
Change in unrealized gains (losses) still held | 0 |  | 0 |
Fixed Maturities | Other Corporate |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 0 |  | 986 |
Realized investment gains (losses) included in earnings | 0 |  | 0 |
Unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 |
Purchases | 0 |  | 0 |
Issuances | 0 |  | 0 |
Sales | 0 |  | 0 |
Settlements | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 0 | [1]
Transfers out of Level 3 | 0 |  | (986) | [2]
Balance, end of period | 0 |  | 0 |
Change in unrealized gains (losses) still held | 0 |  | 0 |
Perpetual securities: | Banks/financial Institutions |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 52 |  | 215 |
Realized investment gains (losses) included in earnings | 0 |  | 0 |
Unrealized gains (losses) included in other comprehensive income (loss) | 4 |  | 0 |
Purchases | 0 |  | 0 |
Issuances | 0 |  | 0 |
Sales | 0 |  | 0 |
Settlements | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 0 | [1]
Transfers out of Level 3 | 0 |  | (215) | [2]
Balance, end of period | 56 |  | 0 |
Change in unrealized gains (losses) still held | 0 |  | 0 |
Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 3 |  | 4 |
Realized investment gains (losses) included in earnings | 0 |  | 0 |
Unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 |
Purchases | 0 |  | 0 |
Issuances | 0 |  | 0 |
Sales | 0 |  | 0 |
Settlements | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 0 | [1]
Transfers out of Level 3 | 0 |  | 0 | [2]
Balance, end of period | 3 |  | 4 |
Change in unrealized gains (losses) still held | 0 |  | 0 |
Derivatives | Interest rate swaps |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 1 | [3] | 29 | [3]
Realized investment gains (losses) included in earnings | (1) | [3] | (4) | [3]
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | [3] | 0 | [3]
Purchases | 0 | [3] | 0 | [3]
Issuances | 0 | [3] | 0 | [3]
Sales | 0 | [3] | 0 | [3]
Settlements | 0 | [3] | 0 | [3]
Transfers into Level 3 | 0 | [3] | 0 | [1],[3]
Transfers out of Level 3 | 0 | [3] | 0 | [2],[3]
Balance, end of period | 0 | [3] | 25 | [3]
Change in unrealized gains (losses) still held | (1) | [3] | (4) | [3]
Derivatives | Foreign currency swaps |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | (99) | [3] | (172) | [3]
Realized investment gains (losses) included in earnings | (10) | [3] | (5) | [3]
Unrealized gains (losses) included in other comprehensive income (loss) | (1) | [3] | (7) | [3]
Purchases | 0 | [3] | 0 | [3]
Issuances | 0 | [3] | 0 | [3]
Sales | 0 | [3] | 0 | [3]
Settlements | 24 | [3] | 0 | [3]
Transfers into Level 3 | 0 | [3] | 0 | [1],[3]
Transfers out of Level 3 | 0 | [3] | 0 | [2],[3]
Balance, end of period | (86) | [3] | (184) | [3]
Change in unrealized gains (losses) still held | (10) | [3] | (5) | [3]
Derivatives | Credit default swaps |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | (3) | [3] | (65) | [3]
Realized investment gains (losses) included in earnings | 2 | [3] | 11 | [3]
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | [3] | 0 | [3]
Purchases | 0 | [3] | 0 | [3]
Issuances | 0 | [3] | 0 | [3]
Sales | 0 | [3] | 0 | [3]
Settlements | 0 | [3] | 0 | [3]
Transfers into Level 3 | 0 | [3] | 0 | [1],[3]
Transfers out of Level 3 | 0 | [3] | 0 | [2],[3]
Balance, end of period | (1) | [3] | (54) | [3]
Change in unrealized gains (losses) still held | $ 2 | [3] | $ 11 | [3]
[1] | Due to a lack of visibility to observe significant inputs to price
[2] | A result of changing our pricing methodology to a valuation method that uses observable market data as significant inputs to estimate fair value
[3] | Derivative assets and liabilities are presented net

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- Definition This element represents the amount of total gains or losses for the period, included in earnings, attributable to the change in unrealized gains (losses) relating to assets classified as Level 3 that are still held at the end of the reporting period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: 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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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