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INVESTMENTS - Available-For-Sale Investments in Debt Securities, Perpetual Securities and Equity Securities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 64,399 | $ 59,515
Gross Unrealized Gains | 4,434 | 3,659
Gross Unrealized Losses | 1,515 | 2,136
Fair Value | 67,318 | 61,038
Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 61,325 | 56,511
Gross Unrealized Gains | 4,214 | 3,468
Gross Unrealized Losses | 1,258 | 1,909
Fair Value | 64,281 | 58,070
Perpetual securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 3,057 | 2,987
Gross Unrealized Gains | 215 | 186
Gross Unrealized Losses | 256 | 226
Fair Value | 3,016 | 2,947
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 17 | 17
Gross Unrealized Gains | 5 | 5
Gross Unrealized Losses | 1 | 1
Fair Value | 21 | 21
Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 28,733 | 25,488
Gross Unrealized Gains | 1,281 | 1,016
Gross Unrealized Losses | 408 | 506
Fair Value | 29,606 | 25,998
Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 32,592 | 31,023
Gross Unrealized Gains | 2,933 | 2,452
Gross Unrealized Losses | 850 | 1,403
Fair Value | 34,675 | 32,072
Japan government and agencies | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 18,152 | 14,936
Gross Unrealized Gains | 608 | 431
Gross Unrealized Losses | 3 | 33
Fair Value | 18,757 | 15,334
Mortgage- and asset-backed Securities | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 666 | 771
Mortgage- and asset-backed Securities | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 444 | 558
Gross Unrealized Gains | 33 | 29
Gross Unrealized Losses | 0 | 0
Fair Value | 477 | 587
Mortgage- and asset-backed Securities | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 169 | 163
Gross Unrealized Gains | 20 | 21
Gross Unrealized Losses | 0 | 0
Fair Value | 189 | 184
Public Utilities | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 7,926 | 7,562
Public Utilities | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 2,223 | 2,261
Gross Unrealized Gains | 96 | 100
Gross Unrealized Losses | 24 | 18
Fair Value | 2,295 | 2,343
Public Utilities | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 5,156 | 4,931
Gross Unrealized Gains | 577 | 471
Gross Unrealized Losses | 102 | 183
Fair Value | 5,631 | 5,219
Sovereign and Supranational | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,544 | 1,523
Sovereign and Supranational | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 937 | 978
Gross Unrealized Gains | 125 | 85
Gross Unrealized Losses | 0 | 28
Fair Value | 1,062 | 1,035
Sovereign and Supranational | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 396 | 404
Gross Unrealized Gains | 86 | 85
Gross Unrealized Losses | 0 | 1
Fair Value | 482 | 488
Banks/financial Institutions | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 6,792 | 6,509
Banks/financial Institutions | Perpetual securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 2,787 | 2,738
Banks/financial Institutions | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 2,926 | 2,799
Gross Unrealized Gains | 235 | 220
Gross Unrealized Losses | 218 | 242
Fair Value | 2,943 | 2,777
Banks/financial Institutions | Yen Denominated | Perpetual securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 2,644 | 2,582
Gross Unrealized Gains | 165 | 151
Gross Unrealized Losses | 250 | 217
Fair Value | 2,559 | 2,516
Banks/financial Institutions | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 3,340 | 3,318
Gross Unrealized Gains | 526 | 447
Gross Unrealized Losses | 17 | 33
Fair Value | 3,849 | 3,732
Banks/financial Institutions | Dollar Denominated | Perpetual securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 199 | 196
Gross Unrealized Gains | 35 | 35
Gross Unrealized Losses | 6 | 9
Fair Value | 228 | 222
Other Corporate | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 27,350 | 25,222
Other Corporate | Perpetual securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 229 | 209
Other Corporate | Yen Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 4,051 | 3,956
Gross Unrealized Gains | 184 | 151
Gross Unrealized Losses | 163 | 185
Fair Value | 4,072 | 3,922
Other Corporate | Yen Denominated | Perpetual securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 214 | 209
Gross Unrealized Gains | 15 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 229 | 209
Other Corporate | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 22,392 | 21,123
Gross Unrealized Gains | 1,611 | 1,347
Gross Unrealized Losses | 725 | 1,170
Fair Value | 23,278 | 21,300
U.S. Government and Agencies | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 141 | 92
Gross Unrealized Gains | 10 | 10
Gross Unrealized Losses | 2 | 4
Fair Value | 149 | 98
Municipalities | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,097 | 1,051
Municipalities | Dollar Denominated | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 998 | 992
Gross Unrealized Gains | 103 | 71
Gross Unrealized Losses | 4 | 12
Fair Value | $ 1,097 | $ 1,051

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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 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 + 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 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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