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INVESTMENTS - Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | $ 79,371 | $ 76,856
Gross Unrealized Gains | 12,266 | 7,733
Gross Unrealized Losses | 375 | 1,694
Fair Value | 91,262 | 82,895
Yen-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 45,684 | 44,027
Gross Unrealized Gains | 7,410 | 5,308
Gross Unrealized Losses | 113 | 435
Fair Value | 52,981 | 48,900
Dollar-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 33,687 | 32,829
Gross Unrealized Gains | 4,856 | 2,425
Gross Unrealized Losses | 262 | 1,259
Fair Value | 38,281 | 33,995
Japan government and agencies | Yen-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 30,929 | 30,637
Gross Unrealized Gains | 5,169 | 3,700
Gross Unrealized Losses | 0 | 140
Fair Value | 36,098 | 34,197
U.S. government and agencies | Dollar-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 293 | 137
Gross Unrealized Gains | 9 | 9
Gross Unrealized Losses | 0 | 1
Fair Value | 302 | 145
Municipalities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | 1,847 | 1,863
Municipalities | Yen-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 516 | 385
Gross Unrealized Gains | 116 | 32
Gross Unrealized Losses | 3 | 9
Fair Value | 629 | 408
Municipalities | Dollar-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 1,077 | 1,343
Gross Unrealized Gains | 141 | 120
Gross Unrealized Losses | 0 | 8
Fair Value | 1,218 | 1,455
Mortgage- and asset-backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | 410 | 339
Mortgage- and asset-backed securities | Yen-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 229 | 155
Gross Unrealized Gains | 25 | 22
Gross Unrealized Losses | 0 | 0
Fair Value | 254 | 177
Mortgage- and asset-backed securities | Dollar-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 149 | 155
Gross Unrealized Gains | 7 | 8
Gross Unrealized Losses | 0 | 1
Fair Value | 156 | 162
Public utilities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | 6,780 | 7,171
Public utilities | Yen-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 1,855 | 1,732
Gross Unrealized Gains | 406 | 280
Gross Unrealized Losses | 0 | 4
Fair Value | 2,261 | 2,008
Public utilities | Dollar-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 3,804 | 4,772
Gross Unrealized Gains | 725 | 496
Gross Unrealized Losses | 10 | 105
Fair Value | 4,519 | 5,163
Sovereign and supranational |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | 1,042 | 1,260
Sovereign and supranational | Yen-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 680 | 826
Gross Unrealized Gains | 50 | 123
Gross Unrealized Losses | 0 | 0
Fair Value | 730 | 949
Sovereign and supranational | Dollar-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 239 | 251
Gross Unrealized Gains | 73 | 60
Gross Unrealized Losses | 0 | 0
Fair Value | 312 | 311
Banks/financial institutions |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | 10,287 | 8,918
Banks/financial institutions | Yen-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 6,152 | 5,440
Gross Unrealized Gains | 700 | 502
Gross Unrealized Losses | 86 | 238
Fair Value | 6,766 | 5,704
Banks/financial institutions | Dollar-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 2,879 | 2,860
Gross Unrealized Gains | 646 | 389
Gross Unrealized Losses | 4 | 35
Fair Value | 3,521 | 3,214
Other corporate |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | 34,496 | 29,002
Other corporate | Yen-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 5,323 | 4,852
Gross Unrealized Gains | 944 | 649
Gross Unrealized Losses | 24 | 44
Fair Value | 6,243 | 5,457
Other corporate | Dollar-denominated |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cost or Amortized Cost | 25,246 | 23,311
Gross Unrealized Gains | 3,255 | 1,343
Gross Unrealized Losses | 248 | 1,109
Fair Value | $ 28,253 | $ 23,545

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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