INVESTMENTS - Pretax Other-Than-Temporary Impairment Losses by Investment Category (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Gain (Loss) on Investments [Line Items]
Other than temporary impairment losses	[1]	$ 14	$ 6
Change in intent impairment
Gain (Loss) on Investments [Line Items]
Other than temporary impairment losses		14	6
Perpetual securities
Gain (Loss) on Investments [Line Items]
Other than temporary impairment losses		2	0
Corporate bonds
Gain (Loss) on Investments [Line Items]
Other than temporary impairment losses		12	2
Banks/financial institutions
Gain (Loss) on Investments [Line Items]
Other than temporary impairment losses		$ 0	$ 4

[1] Includes $14 and $6 for the three-month periods ended March 31, 2016 and 2015, respectively, from change in intent to sell securities