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INVESTMENTS - Available-for-sale Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 87,228 | $ 91,630
Allowance for Credit Losses | 0 | 38
Gross Unrealized Gains | 13,729 | 14,771
Gross Unrealized Losses | 235 | 481
Fair Value | 100,722 | 105,882
Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 52,974 | 56,049
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 7,338 | 8,420
Gross Unrealized Losses | 158 | 198
Fair Value | 60,154 | 64,271
Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 34,254 | 35,581
Allowance for Credit Losses | 0 | 38
Gross Unrealized Gains | 6,391 | 6,351
Gross Unrealized Losses | 77 | 283
Fair Value | 40,568 | 41,611
Japan government and agencies | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 31,549 | 32,959
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 3,574 | 4,182
Gross Unrealized Losses | 62 | 52
Fair Value | 35,061 | 37,089
Municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 2,937 | 3,018
Municipalities | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,224 | 1,324
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 323 | 374
Gross Unrealized Losses | 5 | 5
Fair Value | 1,542 | 1,693
Municipalities | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,217 | 1,154
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 179 | 173
Gross Unrealized Losses | 1 | 2
Fair Value | 1,395 | 1,325
Mortgage- and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 1,292 | 1,038
Mortgage- and asset-backed securities | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 310 | 342
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 21 | 27
Gross Unrealized Losses | 1 | 1
Fair Value | 330 | 368
Mortgage- and asset-backed securities | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 932 | 667
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 30 | 8
Gross Unrealized Losses | 0 | 5
Fair Value | 962 | 670
Public utilities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 10,315 | 10,817
Public utilities | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,584 | 4,777
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 930 | 1,096
Gross Unrealized Losses | 2 | 1
Fair Value | 5,512 | 5,872
Public utilities | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,887 | 4,013
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 920 | 947
Gross Unrealized Losses | 4 | 15
Fair Value | 4,803 | 4,945
Sovereign and supranational |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 1,142 | 1,382
Sovereign and supranational | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 781 | 981
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 81 | 108
Gross Unrealized Losses | 0 | 0
Fair Value | 862 | 1,089
Sovereign and supranational | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 225 | 232
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 59 | 64
Gross Unrealized Losses | 4 | 3
Fair Value | 280 | 293
Banks/financial institutions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 11,742 | 12,060
Banks/financial institutions | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,149 | 7,552
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 834 | 886
Gross Unrealized Losses | 66 | 102
Fair Value | 7,917 | 8,336
Banks/financial institutions | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,081 | 2,973
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 745 | 758
Gross Unrealized Losses | 1 | 7
Fair Value | 3,825 | 3,724
Other corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 38,068 | 40,217
Other corporate | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,377 | 8,114
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 1,575 | 1,747
Gross Unrealized Losses | 22 | 37
Fair Value | 8,930 | 9,824
Other corporate | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 24,757 | 26,297
Allowance for Credit Losses | 0 | 38
Gross Unrealized Gains | 4,448 | 4,385
Gross Unrealized Losses | 67 | 251
Fair Value | 29,138 | 30,393
U.S. government and agencies | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 155 | 245
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 10 | 16
Gross Unrealized Losses | 0 | 0
Fair Value | $ 165 | $ 261

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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=123581744&loc=d3e27161-111563 + Details
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