INVESTMENTS - Pretax Other-Than-Temporary Impairment Losses by Investment Category (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gain (Loss) on Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	[1]	$ 137	$ 0	$ 143	$ 31
Change in intent impairment
Gain (Loss) on Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		6	0	12	31
Credit-related impairment [Member]
Gain (Loss) on Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		131		131
Corporate bonds
Gain (Loss) on Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		5	0	7	31
Banks/financial institutions
Gain (Loss) on Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		131	0	135	0
Equity securities
Gain (Loss) on Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		$ 1	$ 0	$ 1	$ 0

[1] Includes $6 and $0 for the three-month periods and $12 and $31 for the nine-month periods ended September 30, 2015 and 2014, respectively, from change in intent to sell securities; and $131 for the three- and nine-month periods ended September 30, 2015, for credit-related impairment