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INVESTMENTS - Held-to-Maturity Investments in Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | $ 38,772 | $ 33,459
Gross Unrealized Gains | 9,220 | 4,278
Gross Unrealized Losses | 55 | 217
Fair Value | 47,937 | 37,520
Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value | 47,937 | 37,520
Yen-denominated | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 38,772 | 33,459
Gross Unrealized Gains | 9,220 | 4,278
Gross Unrealized Losses | 55 | 217
Fair Value | 47,937 | 37,520
Japan government and agencies | Yen-denominated | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 23,852 | 20,004
Gross Unrealized Gains | 7,241 | 3,387
Gross Unrealized Losses | 0 | 0
Fair Value | 31,093 | 23,391
Municipalities | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 404 | 341
Fair Value | 549 | 415
Municipalities | Yen-denominated | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 404 | 341
Gross Unrealized Gains | 145 | 74
Gross Unrealized Losses | 0 | 0
Fair Value | 549 | 415
Mortgage- and asset-backed securities | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 37 | 36
Fair Value | 39 | 38
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 | 37 | 36
Gross Unrealized Gains | 2 | 2
Gross Unrealized Losses | 0 | 0
Fair Value | 39 | 38
Public utilities | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,687 | 3,092
Fair Value | 4,198 | 3,203
Public utilities | Yen-denominated | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,687 | 3,092
Gross Unrealized Gains | 525 | 205
Gross Unrealized Losses | 14 | 94
Fair Value | 4,198 | 3,203
Sovereign and supranational | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 2,998 | 2,555
Fair Value | 3,394 | 2,711
Sovereign and supranational | Yen-denominated | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 2,998 | 2,555
Gross Unrealized Gains | 402 | 182
Gross Unrealized Losses | 6 | 26
Fair Value | 3,394 | 2,711
Banks/financial institutions | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 4,544 | 4,431
Fair Value | 4,790 | 4,546
Banks/financial institutions | Yen-denominated | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 4,544 | 4,431
Gross Unrealized Gains | 271 | 168
Gross Unrealized Losses | 25 | 53
Fair Value | 4,790 | 4,546
Other corporate | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,250 | 3,000
Fair Value | 3,874 | 3,216
Other corporate | Yen-denominated | Fixed maturities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 3,250 | 3,000
Gross Unrealized Gains | 634 | 260
Gross Unrealized Losses | 10 | 44
Fair Value | $ 3,874 | $ 3,216

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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 (a) -URI http://asc.fasb.org/extlink&oid=73527792&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=65884222&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 (f) -URI http://asc.fasb.org/extlink&oid=73527792&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 Amount of accumulated unrealized gain on 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 (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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