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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Line Items] |  |  |
Japan Tax Rate | 28.00% | 28.00% | 28.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax Asset (Liability) | $ 208 | $ 174 | $ 452
U.S. federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00%
Non-life operating loss carryforwards, limitations | only 35% of non-life operating losses can be offset against life insurance taxable income each year |  |
Unrecognized tax benefit, deductibility highly certain, timing uncertain | $ 0 | $ 0 |
Unrecognized tax benefits, interest and penalties expense | 0 | 0 | $ 0
Unrecognized tax benefits, accrued interest and penalties | 0 | $ 0 |
Non-life |  |  |
Income Taxes [Line Items] |  |  |
Non-life operating loss carryforwards | 26 |  |
Life |  |  |
Income Taxes [Line Items] |  |  |
Non-life operating loss carryforwards | 92 |  |
Capital Loss Carryforward |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforward, amount | 0 |  |
Foreign Tax Credit |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforward, amount | $ 314 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.1.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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