INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Unrecognized tax benefit, deductibility highly certain, timing uncertain	$ 293	$ 261
Japan Tax Rate	28.80%	30.80%	33.30%
The expected U.S. tax rate	35.00%	35.00%	35.00%
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 benefits, permanent uncertainties	$ 1
Unrecognized tax benefits, interest and penalties expense	13	$ 11	$ 11
Unrecognized tax benefits, accrued interest and penalties	26	$ 22
Capital loss carryforwards	$ 9