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INVESTMENTS - Held-to-Maturity Investments in Debt Securities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | $ 45,204 | $ 54,426
Gross Unrealized Gains | 3,057 | 1,213
Gross Unrealized Losses | 1,214 | 798
Fair Value | 47,047 | 54,841
Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 45,204 | 54,426
Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 45,204 | 54,426
Gross Unrealized Gains | 3,057 | 1,213
Gross Unrealized Losses | 1,214 | 798
Fair Value | 47,047 | 54,841
Japan government and agencies | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 24,606 | 32,043
Japan government and agencies | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 24,606 | 32,043
Gross Unrealized Gains | 2,154 | 356
Gross Unrealized Losses | 0 | 67
Fair Value | 26,760 | 32,332
Municipalities | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 452 | 492
Municipalities | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 452 | 492
Gross Unrealized Gains | 65 | 30
Gross Unrealized Losses | 0 | 2
Fair Value | 517 | 520
Mortgage- and asset-backed Securities | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 77 | 90
Mortgage- and asset-backed Securities | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 77 | 90
Gross Unrealized Gains | 4 | 4
Gross Unrealized Losses | 0 | 0
Fair Value | 81 | 94
Public Utilities | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 4,532 | 4,924
Public Utilities | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 4,532 | 4,924
Gross Unrealized Gains | 202 | 233
Gross Unrealized Losses | 222 | 106
Fair Value | 4,512 | 5,051
Sovereign and Supranational | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 2,953 | 3,209
Sovereign and Supranational | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 2,953 | 3,209
Gross Unrealized Gains | 220 | 192
Gross Unrealized Losses | 100 | 84
Fair Value | 3,073 | 3,317
Banks/financial Institutions | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 8,480 | 9,211
Banks/financial Institutions | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 8,480 | 9,211
Gross Unrealized Gains | 163 | 211
Gross Unrealized Losses | 690 | 431
Fair Value | 7,953 | 8,991
Other Corporate | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 4,104 | 4,457
Other Corporate | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cost or Amortized Cost | 4,104 | 4,457
Gross Unrealized Gains | 249 | 187
Gross Unrealized Losses | 202 | 108
Fair Value | $ 4,151 | $ 4,536

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- Definition For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 5 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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- Definition This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -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 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
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- Definition As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -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 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
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- Definition As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -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 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
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