INVESTMENTS - Pretax Other-Than-Temporary Impairment Losses by Investment Category (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	$ 10	[1]	$ 97	[1]	$ 65	[1]	$ 643	[1]
Credit-related impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		70		0		365
Severity and duration of decline in fair value impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		27		1		27
Change in intent impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	10		0		64		251
Perpetual Securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		27		0		243
Corporate Bonds
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	3		70		41		253
Mortgage- and asset-backed Securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		0		0		3
Sovereign and Supranational
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	7		0		23		144
Equity Securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	$ 0		$ 0		$ 1		$ 0

[1] Includes $0 and $70 for the three-month periods and $0 and $365 for the nine-month periods ended September 30, 2013 and 2012, respectively, for credit-related impairments; $0 and $27 for the three-month periods and $1 and $27 for the nine-month periods ended September 30, 2013 and 2012, respectively, for impairments due to severity and duration of decline in fair value; and $10 and $0 for the three-month periods and $64 and $251 for the nine-month periods ended September 30, 2013 and 2012, respectively, from change in intent to sell securities