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v3.24.1.u1

INVESTMENTS - Available-for-sale Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | $ 67,594 | $ 70,689 |  |
Allowance for Credit Losses | 0 | 0 | $ 0 | $ 0
Gross Unrealized Gains | 6,038 | 6,050 |  |
Gross Unrealized Losses | 3,502 | 3,449 |  |
Fair Value | 70,130 | 73,290 |  |
Yen-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 37,393 | 40,174 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 2,254 | 2,529 |  |
Gross Unrealized Losses | 2,496 | 2,513 |  |
Fair Value | 37,151 | 40,190 |  |
Dollar-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 30,201 | 30,515 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 3,784 | 3,521 |  |
Gross Unrealized Losses | 1,006 | 936 |  |
Fair Value | 32,979 | 33,100 |  |
Japan government and agencies | Yen-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 21,577 | 23,067 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 874 | 1,040 |  |
Gross Unrealized Losses | 1,811 | 1,696 |  |
Fair Value | 20,640 | 22,411 |  |
Municipalities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fair Value | 2,210 | 2,298 |  |
Municipalities | Yen-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 907 | 968 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 102 | 115 |  |
Gross Unrealized Losses | 59 | 58 |  |
Fair Value | 950 | 1,025 |  |
Municipalities | Dollar-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 1,237 | 1,246 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 72 | 65 |  |
Gross Unrealized Losses | 49 | 38 |  |
Fair Value | 1,260 | 1,273 |  |
Mortgage- and asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fair Value | 3,385 | 3,086 |  |
Mortgage- and asset-backed securities | Yen-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 201 | 215 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 6 | 6 |  |
Gross Unrealized Losses | 12 | 11 |  |
Fair Value | 195 | 210 |  |
Mortgage- and asset-backed securities | Dollar-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 2,968 | 2,748 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 270 | 184 |  |
Gross Unrealized Losses | 48 | 56 |  |
Fair Value | 3,190 | 2,876 |  |
Public utilities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fair Value | 7,313 | 7,592 |  |
Public utilities | Yen-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 3,281 | 3,757 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 262 | 325 |  |
Gross Unrealized Losses | 77 | 82 |  |
Fair Value | 3,466 | 4,000 |  |
Public utilities | Dollar-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 3,595 | 3,346 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 388 | 360 |  |
Gross Unrealized Losses | 136 | 114 |  |
Fair Value | 3,847 | 3,592 |  |
Sovereign and supranational |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fair Value | 490 | 537 |  |
Sovereign and supranational | Yen-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 349 | 373 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 24 | 24 |  |
Gross Unrealized Losses | 7 | 7 |  |
Fair Value | 366 | 390 |  |
Sovereign and supranational | Dollar-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 95 | 122 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 33 | 33 |  |
Gross Unrealized Losses | 4 | 8 |  |
Fair Value | 124 | 147 |  |
Banks/financial institutions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fair Value | 8,899 | 8,835 |  |
Banks/financial institutions | Yen-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 5,546 | 5,896 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 323 | 320 |  |
Gross Unrealized Losses | 285 | 365 |  |
Fair Value | 5,584 | 5,851 |  |
Banks/financial institutions | Dollar-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 2,971 | 2,676 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 385 | 359 |  |
Gross Unrealized Losses | 41 | 51 |  |
Fair Value | 3,315 | 2,984 |  |
Other corporate |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fair Value | 27,019 | 28,342 |  |
Other corporate | Yen-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 5,532 | 5,898 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 663 | 699 |  |
Gross Unrealized Losses | 245 | 294 |  |
Fair Value | 5,950 | 6,303 |  |
Other corporate | Dollar-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 19,158 | 20,186 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 2,635 | 2,518 |  |
Gross Unrealized Losses | 724 | 665 |  |
Fair Value | 21,069 | 22,039 |  |
U.S. government and agencies | Dollar-denominated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 177 | 191 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 1 | 2 |  |
Gross Unrealized Losses | 4 | 4 |  |
Fair Value | $ 174 | $ 189 |  |

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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