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INVESTMENTS - Available-For-Sale Investments in Debt Securities, Perpetual Securities and Equity Securities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 56,430 | $ 57,646
Gross Unrealized Gains | 4,472 | 4,716
Gross Unrealized Losses | 1,469 | 784
Fair Value | 59,433 | 61,578
Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 52,779 | 53,413
Gross Unrealized Gains | 4,368 | 4,453
Gross Unrealized Losses | 871 | 613
Fair Value | 56,276 | 57,253
Perpetual Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 3,633 | 4,213
Gross Unrealized Gains | 98 | 259
Gross Unrealized Losses | 598 | 170
Fair Value | 3,133 | 4,302
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 18 | 20
Gross Unrealized Gains | 6 | 4
Gross Unrealized Losses | 0 | 1
Fair Value | 24 | 23
Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 24,598 | 27,481
Gross Unrealized Gains | 1,341 | 1,050
Gross Unrealized Losses | 553 | 487
Fair Value | 25,386 | 28,044
Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 28,181 | 25,932
Gross Unrealized Gains | 3,027 | 3,403
Gross Unrealized Losses | 318 | 126
Fair Value | 30,890 | 29,209
Japan government and agencies | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 12,035 | 12,612
Gross Unrealized Gains | 748 | 349
Gross Unrealized Losses | 0 | 81
Fair Value | 12,783 | 12,880
Mortgage- and asset-backed Securities | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 671 | 746
Gross Unrealized Gains | 44 | 40
Gross Unrealized Losses | 1 | 1
Fair Value | 714 | 785
Mortgage- and asset-backed Securities | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 182 | 188
Gross Unrealized Gains | 58 | 58
Gross Unrealized Losses | 0 | 0
Fair Value | 240 | 246
Public Utilities | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 2,928 | 3,608
Gross Unrealized Gains | 116 | 116
Gross Unrealized Losses | 53 | 72
Fair Value | 2,991 | 3,652
Public Utilities | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 4,581 | 4,204
Gross Unrealized Gains | 609 | 658
Gross Unrealized Losses | 31 | 17
Fair Value | 5,159 | 4,845
Sovereign and Supranational | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 1,120 | 1,404
Gross Unrealized Gains | 61 | 71
Gross Unrealized Losses | 7 | 0
Fair Value | 1,174 | 1,475
Sovereign and Supranational | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 468 | 476
Gross Unrealized Gains | 112 | 123
Gross Unrealized Losses | 2 | 2
Fair Value | 578 | 597
Banks/financial Institutions | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 2,952 | 3,455
Gross Unrealized Gains | 183 | 233
Gross Unrealized Losses | 236 | 180
Fair Value | 2,899 | 3,508
Banks/financial Institutions | Yen Denominated | Perpetual Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 3,080 | 3,635
Gross Unrealized Gains | 73 | 193
Gross Unrealized Losses | 525 | 161
Fair Value | 2,628 | 3,667
Banks/financial Institutions | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 3,578 | 3,626
Gross Unrealized Gains | 502 | 506
Gross Unrealized Losses | 8 | 6
Fair Value | 4,072 | 4,126
Banks/financial Institutions | Dollar Denominated | Perpetual Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 268 | 269
Gross Unrealized Gains | 25 | 23
Gross Unrealized Losses | 6 | 9
Fair Value | 287 | 283
Other Corporate | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 4,892 | 5,656
Gross Unrealized Gains | 189 | 241
Gross Unrealized Losses | 256 | 153
Fair Value | 4,825 | 5,744
Other Corporate | Yen Denominated | Perpetual Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 285 | 309
Gross Unrealized Gains | 0 | 43
Gross Unrealized Losses | 67 | 0
Fair Value | 218 | 352
Other Corporate | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 18,259 | 16,300
Gross Unrealized Gains | 1,581 | 1,878
Gross Unrealized Losses | 271 | 95
Fair Value | 19,569 | 18,083
U.S. Government and Agencies | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 95 | 93
Gross Unrealized Gains | 16 | 24
Gross Unrealized Losses | 0 | 0
Fair Value | 111 | 117
Municipalities | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 1,018 | 1,045
Gross Unrealized Gains | 149 | 156
Gross Unrealized Losses | 6 | 6
Fair Value | $ 1,161 | $ 1,195

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: 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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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 This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 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. + Details
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