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INVESTMENTS - Available-for-sale Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 69,161 | $ 75,469
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 5,061 | 4,800
Gross Unrealized Losses | 4,421 | 4,528
Fair Value | 69,801 | 75,741
Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 39,132 | 43,920
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 2,173 | 2,595
Gross Unrealized Losses | 2,636 | 2,849
Fair Value | 38,669 | 43,666
Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 30,029 | 31,549
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 2,888 | 2,205
Gross Unrealized Losses | 1,785 | 1,679
Fair Value | 31,132 | 32,075
Japan government and agencies | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 22,605 | 25,418
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 863 | 1,259
Gross Unrealized Losses | 1,695 | 1,724
Fair Value | 21,773 | 24,953
Municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 2,141 | 2,320
Municipalities | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 918 | 1,034
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 105 | 124
Gross Unrealized Losses | 58 | 61
Fair Value | 965 | 1,097
Municipalities | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,241 | 1,269
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 47 | 43
Gross Unrealized Losses | 112 | 89
Fair Value | 1,176 | 1,223
Mortgage- and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 2,996 | 2,146
Mortgage- and asset-backed securities | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 206 | 241
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 6 | 8
Gross Unrealized Losses | 11 | 12
Fair Value | 201 | 237
Mortgage- and asset-backed securities | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,641 | 1,926
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 228 | 67
Gross Unrealized Losses | 74 | 84
Fair Value | 2,795 | 1,909
Public utilities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 7,250 | 7,666
Public utilities | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,652 | 3,932
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 292 | 301
Gross Unrealized Losses | 89 | 108
Fair Value | 3,855 | 4,125
Public utilities | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,342 | 3,481
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 291 | 240
Gross Unrealized Losses | 238 | 180
Fair Value | 3,395 | 3,541
Sovereign and supranational |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 511 | 834
Sovereign and supranational | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 355 | 659
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 19 | 24
Gross Unrealized Losses | 6 | 5
Fair Value | 368 | 678
Sovereign and supranational | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 121 | 133
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 31 | 35
Gross Unrealized Losses | 9 | 12
Fair Value | 143 | 156
Banks/financial institutions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 8,341 | 9,299
Banks/financial institutions | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,561 | 6,348
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 301 | 324
Gross Unrealized Losses | 403 | 531
Fair Value | 5,459 | 6,141
Banks/financial institutions | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,696 | 2,992
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 285 | 271
Gross Unrealized Losses | 99 | 105
Fair Value | 2,882 | 3,158
Other corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 26,610 | 28,362
Other corporate | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,835 | 6,288
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 587 | 555
Gross Unrealized Losses | 374 | 408
Fair Value | 6,048 | 6,435
Other corporate | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 19,799 | 21,579
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 2,006 | 1,549
Gross Unrealized Losses | 1,243 | 1,201
Fair Value | 20,562 | 21,927
U.S. government and agencies | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 189 | 169
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 10 | 8
Fair Value | $ 179 | $ 161

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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