INVESTMENTS - Pretax Other-Than-Temporary Impairment Losses by Investment Category (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	$ 0	[1]	$ 343	[1]	$ 55	[1]	$ 546	[1]
Credit-related impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		267		0		295
Change in intent impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		76		54		251
Severity and duration of decline in fair value impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0				1
Perpetual Securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		76		0		216
Corporate Bonds
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		120		38		183
Mortgage- and asset-backed Securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		3		0		3
Sovereign and Supranational
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0		144		16		144
Equity Securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	$ 0		$ 0		$ 1		$ 0

[1] Includes $0 and $267 for the three-month periods and $0 and $295 for the six-month periods ended June 30, 2013 and 2012, respectively, for credit-related impairments; $0 for the three-month period and $1 for the six-month period ended June 30, 2013 for impairments due to severity and duration of decline in fair value; and $0 and $76 for the three-month periods and $54 and $251 for the six-month periods ended June 30, 2013 and 2012, respectively, from change in intent to sell securities