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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
Japan Tax Rate |  | 28.20% | 28.00% | 28.00% | 28.20%
U.S. federal statutory corporate income tax rate | 21.00% |  | 21.00% | 21.00% | 35.00%
Income Tax Expense, Gross, Continuing Operations, Adjustment of Deferred Tax Assets |  | $ 1,000.0 |  |  |
Income Tax Benefit, Gross, Continuing Operations, Adjustment of Deferred Tax Liabilities |  | 2,900.0 |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax Asset (Liability) |  | $ (1,900.0) |  | $ 0.4 |
Deferred Tax Assets, Valuation Allowance |  |  | $ 1,340.0 | 738.0 |
Non-life operating loss carryforwards, limitations |  |  | only 35% of non-life operating losses can be offset against life insurance taxable income each year |  |
Operating Loss Carryforwards |  |  | $ 99.0 |  |
Unrecognized tax benefit, deductibility highly certain, timing uncertain |  |  | 15.0 | 14.0 |
Unrecognized tax benefits, permanent uncertainties |  |  | 2.0 |  |
Unrecognized tax benefits, interest and penalties expense |  |  | 1.0 | 1.0 | $ 1.0
Unrecognized tax benefits, accrued interest and penalties |  |  | 2.0 | $ 2.0 |
Anticipatory Foreign Tax Credit |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  | 1,022.0 |  |
Deferred Foreign Tax Credit |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  | 318.0 |  |
Capital Loss Carryforward |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax Credit Carryforward, Amount |  |  | 161.0 |  |
Expiring in 2039 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  |  | 31.0 |  |
No expiration |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  |  | 68.0 |  |
Expiring in 2023 | Capital Loss Carryforward |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax Credit Carryforward, Amount |  |  | 65.0 |  |
Expiring in 2024 | Capital Loss Carryforward |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax Credit Carryforward, Amount |  |  | $ 96.0 |  |

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