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INVESTMENTS - Held-to-Maturity Investments in Debt Securities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | $ 40,858 | $ 44,415
Gross Unrealized Gains | 2,464 | 2,041
Gross Unrealized Losses | 506 | 610
Fair Value | 42,816 | 45,846
Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 40,858 | 44,415
Fair Value | 42,816 | 45,846
Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 40,858 | 44,415
Gross Unrealized Gains | 2,464 | 2,041
Gross Unrealized Losses | 506 | 610
Fair Value | 42,816 | 45,846
Japan government and agencies | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 23,461 | 27,362
Fair Value | 25,129 | 28,708
Japan government and agencies | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 23,461 | 27,362
Gross Unrealized Gains | 1,668 | 1,347
Gross Unrealized Losses | 0 | 1
Fair Value | 25,129 | 28,708
Municipalities | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 409 | 399
Fair Value | 455 | 440
Municipalities | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 409 | 399
Gross Unrealized Gains | 46 | 41
Gross Unrealized Losses | 0 | 0
Fair Value | 455 | 440
Mortgage- and asset-backed Securities | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 58 | 58
Fair Value | 61 | 61
Mortgage- and asset-backed Securities | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 58 | 58
Gross Unrealized Gains | 3 | 3
Gross Unrealized Losses | 0 | 0
Fair Value | 61 | 61
Public Utilities | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,993 | 3,900
Fair Value | 4,075 | 3,928
Public Utilities | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,993 | 3,900
Gross Unrealized Gains | 189 | 150
Gross Unrealized Losses | 107 | 122
Fair Value | 4,075 | 3,928
Sovereign and Supranational | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,011 | 2,941
Fair Value | 3,118 | 3,040
Sovereign and Supranational | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,011 | 2,941
Gross Unrealized Gains | 163 | 171
Gross Unrealized Losses | 56 | 72
Fair Value | 3,118 | 3,040
Banks/financial Institutions | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 6,398 | 6,310
Fair Value | 6,277 | 6,128
Banks/financial Institutions | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 6,398 | 6,310
Gross Unrealized Gains | 174 | 146
Gross Unrealized Losses | 295 | 328
Fair Value | 6,277 | 6,128
Other Corporate | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,528 | 3,445
Fair Value | 3,701 | 3,541
Other Corporate | Yen Denominated | Fixed Maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,528 | 3,445
Gross Unrealized Gains | 221 | 183
Gross Unrealized Losses | 48 | 87
Fair Value | $ 3,701 | $ 3,541

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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 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=27724398&loc=d3e27232-111563 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -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 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Amount of unrecognized gain before loss on investments in held-to-maturity securities. + References Reference 1: 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=27724398&loc=d3e27232-111563 + Details
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- Definition Amount of unrecognized loss before gain on investments in held-to-maturity securities. Excludes write-down for other than temporary impairment (OTTI). + References Reference 1: 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=27724398&loc=d3e27232-111563 + Details
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