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INVESTMENTS - Available-for-sale Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 71,035 | $ 85,369
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 6,162 | 13,566
Gross Unrealized Losses | 3,554 | 239
Fair Value | 73,643 | 98,696
Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 40,253 | 51,160
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 3,129 | 6,994
Gross Unrealized Losses | 1,957 | 167
Fair Value | 41,425 | 57,987
Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 30,782 | 34,209
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 3,033 | 6,572
Gross Unrealized Losses | 1,597 | 72
Fair Value | 32,218 | 40,709
Japan government and agencies | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 23,342 | 30,335
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 1,558 | 3,343
Gross Unrealized Losses | 1,158 | 61
Fair Value | 23,742 | 33,617
Municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 2,276 | 3,036
Municipalities | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 947 | 1,192
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 164 | 322
Gross Unrealized Losses | 40 | 5
Fair Value | 1,071 | 1,509
Municipalities | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,252 | 1,340
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 58 | 189
Gross Unrealized Losses | 105 | 2
Fair Value | 1,205 | 1,527
Mortgage- and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 2,009 | 1,246
Mortgage- and asset-backed securities | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 231 | 300
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 9 | 19
Gross Unrealized Losses | 8 | 1
Fair Value | 232 | 318
Mortgage- and asset-backed securities | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,732 | 897
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 119 | 33
Gross Unrealized Losses | 74 | 2
Fair Value | 1,777 | 928
Public utilities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 7,350 | 10,051
Public utilities | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,605 | 4,462
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 303 | 906
Gross Unrealized Losses | 87 | 2
Fair Value | 3,821 | 5,366
Public utilities | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,398 | 3,781
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 312 | 909
Gross Unrealized Losses | 181 | 5
Fair Value | 3,529 | 4,685
Sovereign and supranational |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 862 | 1,115
Sovereign and supranational | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 603 | 760
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 34 | 82
Gross Unrealized Losses | 1 | 0
Fair Value | 636 | 842
Sovereign and supranational | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 194 | 222
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 45 | 57
Gross Unrealized Losses | 13 | 6
Fair Value | 226 | 273
Banks/financial institutions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 9,031 | 11,591
Banks/financial institutions | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,813 | 6,963
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 365 | 787
Gross Unrealized Losses | 399 | 72
Fair Value | 5,779 | 7,678
Banks/financial institutions | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,002 | 3,169
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 347 | 747
Gross Unrealized Losses | 97 | 3
Fair Value | 3,252 | 3,913
Other corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 28,205 | 37,837
Other corporate | Yen-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,712 | 7,148
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 696 | 1,535
Gross Unrealized Losses | 264 | 26
Fair Value | 6,144 | 8,657
Other corporate | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 21,028 | 24,604
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 2,152 | 4,629
Gross Unrealized Losses | 1,119 | 53
Fair Value | 22,061 | 29,180
U.S. government and agencies | Dollar-denominated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 176 | 196
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 0 | 8
Gross Unrealized Losses | 8 | 1
Fair Value | $ 168 | $ 203

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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