INVESTMENTS - Pretax Other-Than-Temporary Impairment Losses by Investment Category (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	$ 31	[1]	$ 199	[1]	$ 977	[1]
Credit-related impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses			45		597
Severity and duration of decline in fair value impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses			26		27
Change in intent impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	31		128		353
Perpetual securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		70		243
Corporate Bonds
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	31		102		345
Mortgage- and asset-backed securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		0		3
Sovereign and supranational
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		26		386
Equity securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	$ 0		$ 1		$ 0

[1] Includes $45 and $597 for the years ended December 31, 2013 and 2012, respectively, for credit-related impairments; $26 and $27 for the years ended December 31, 2013 and 2012, respectively, for impairments due to severity and duration of decline in fair value; and $31, $128 and $353 for the years ended December 31, 2014, 2013 and 2012, respectively, from change in intent to sell securities