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INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | $ 30,085 | $ 30,318
Gross Unrealized Gains | 7,519 | 6,470
Gross Unrealized Losses | 10 | 66
Fair Value | 37,594 | 36,722
Yen-denominated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 30,085 | 30,318
Gross Unrealized Gains | 7,519 | 6,470
Gross Unrealized Losses | 10 | 66
Fair Value | 37,594 | 36,722
Japan government and agencies | Yen-denominated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 22,241 | 21,712
Gross Unrealized Gains | 6,050 | 5,326
Gross Unrealized Losses | 0 | 0
Fair Value | 28,291 | 27,038
Municipalities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 821 | 359
Fair Value | 1,083 | 469
Municipalities | Yen-denominated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 821 | 359
Gross Unrealized Gains | 262 | 110
Gross Unrealized Losses | 0 | 0
Fair Value | 1,083 | 469
Mortgage- and asset-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 16 | 14
Fair Value | 17 | 15
Mortgage- and asset-backed securities | Yen-denominated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 16 | 14
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 0 | 0
Fair Value | 17 | 15
Public utilities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 2,535 | 2,727
Fair Value | 2,954 | 2,973
Public utilities | Yen-denominated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 2,535 | 2,727
Gross Unrealized Gains | 419 | 254
Gross Unrealized Losses | 0 | 8
Fair Value | 2,954 | 2,973
Sovereign and supranational |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 1,123 | 1,551
Fair Value | 1,320 | 1,840
Sovereign and supranational | Yen-denominated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 1,123 | 1,551
Gross Unrealized Gains | 197 | 289
Gross Unrealized Losses | 0 | 0
Fair Value | 1,320 | 1,840
Banks/financial institutions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 916 | 1,445
Fair Value | 1,018 | 1,583
Banks/financial institutions | Yen-denominated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 916 | 1,445
Gross Unrealized Gains | 105 | 158
Gross Unrealized Losses | 3 | 20
Fair Value | 1,018 | 1,583
Other corporate |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 2,433 | 2,510
Fair Value | 2,911 | 2,804
Other corporate | Yen-denominated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, fixed maturities, amortized cost | 2,433 | 2,510
Gross Unrealized Gains | 485 | 332
Gross Unrealized Losses | 7 | 38
Fair Value | $ 2,911 | $ 2,804

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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