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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Line Items] |  |  |  |
Japan Tax Rate |  | 28.00% | 28.00% | 28.00%
U.S. federal statutory corporate income tax rate |  | 21.00% | 21.00% | 21.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax Asset (Liability) |  | $ 174 | $ 452 |
Non-life operating loss carryforwards, limitations |  | only 35% of non-life operating losses can be offset against life insurance taxable income each year |  |
Non-life operating loss carryforwards |  | $ 109 |  |
Unrecognized tax benefit, deductibility highly certain, timing uncertain |  | 0 |  |
Unrecognized tax benefits, permanent uncertainties |  | 1 |  |
Unrecognized tax benefits, interest and penalties expense |  | 0 | 0 | $ 1
Unrecognized tax benefits, accrued interest and penalties |  | 0 | $ 0 |
Inflation Reduction Act, excise tax on share repurchases | 1.00% |  |  |
Capital Loss Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward, amount |  | 0 |  |
Foreign Tax Credit |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward, amount |  | $ 0 |  |

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns for which the ultimate deductibility is highly certain, but which there is uncertainty about the timing of such deductibility + References No definition available. + Details
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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 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 Reference 2: 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 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.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-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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