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