INVESTMENTS - Pretax Other-Than-Temporary Impairment Losses by Investment Category (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	[1]	$ 153	$ 31	$ 199
Credit-related impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses		131		45
Severity and duration of decline in fair value impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses				26
Change in intent impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses		22	31	128
Perpetual securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses		0	0	70
Corporate bonds
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses		17	31	102
Banks/financial institutions
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses		135	0	0
Sovereign and supranational
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses		0	0	26
Equity securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses		$ 1	$ 0	$ 1

[1] Includes $131 and $45 for the years ended December 31, 2015 and 2013, respectively, for credit-related impairments; $26 for the year ended December 31, 2013 for impairments due to severity and duration of decline in fair value; and $22, $31 and $128 for the years ended December 31, 2015, 2014 and 2013, respectively, from change in intent to sell securities