INCOME TAXES - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	Jan. 01, 2023	Sep. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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)		$ 1,400	$ 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			$ 18
Unrecognized tax benefit, deductibility highly certain, timing uncertain			0
Unrecognized tax benefits, permanent uncertainties			5
Unrecognized tax benefits, interest and penalties expense			0	$ 1	$ 1
Unrecognized tax benefits, accrued interest and penalties			$ 0	$ 0
Income tax benefit from release of deferred tax liability, earnings per share, basic			$ 0.71
Income tax benefit from release of deferred tax liability, earnings per share, diluted			$ 0.71
Subsequent Event
Income Taxes [Line Items]
Inflation Reduction Act, Alternative Minimum Corporate Tax Rate	15.00%
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			65
Tax Year 2030 | Foreign Tax Credit
Income Taxes [Line Items]
Tax credit carryforward, amount			20
Tax Year 2031 | Foreign Tax Credit
Income Taxes [Line Items]
Tax credit carryforward, amount			20
Tax Year 2032 | Foreign Tax Credit
Income Taxes [Line Items]
Tax credit carryforward, amount			$ 25