INVESTMENTS - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended					6 Months Ended				12 Months Ended
	Jun. 30, 2013 investment		Jun. 30, 2012 investment		Mar. 31, 2012 investment	Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Schedule of Investments [Line Items]
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, number of investments	1		5		1
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, amortized cost	$ 297		$ 842		$ 122	$ 297		$ 842
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, aggregate unrealized gain (loss)	(108)		(268)		(23)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0	[1]	343	[1]		55	[1]	546	[1]
Unrealized Gain (Loss)						5				3,932
Percentage that the lending policy requires that the fair value of the securities and/or unrestricted cash received as collateral be of the fair value of the loaned securities	102.00%					102.00%
Variable Interest Entity, Not Consolidated
Schedule of Investments [Line Items]
Securities available for sale, fixed maturities, fair value	6,815					6,815				8,350
Number of issuers of VIEs not-consolidated						160
Perpetual Securities
Schedule of Investments [Line Items]
Perpetual securities, interest coupons that were fixed at issuance subsequently change to a floating short-term interest rate						floating short-term interest rate of 125 to more than 300 basis points above an appropriate market index
Maturity date (in years)						25 years
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0		76			0		216
Unrealized Gain (Loss)						(432)				89
Perpetual Securities | Lower Limit
Schedule of Investments [Line Items]
Perpetual securities, floating short-term interest rate basis point above market index	1.25%					1.25%
Perpetual Securities | Minimum Upper Limit
Schedule of Investments [Line Items]
Perpetual securities, floating short-term interest rate basis point above market index	3.00%					3.00%
Severity and duration of decline in fair value impairment
Schedule of Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0					1
Change in intent impairment
Schedule of Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0		76			54		251
Credit-related impairment
Schedule of Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0		267			0		295
Tier I | Perpetual Securities
Schedule of Investments [Line Items]
Unrealized Gain (Loss)						(156)				(48)
Upper Tier II | Perpetual Securities
Schedule of Investments [Line Items]
Unrealized Gain (Loss)						(207)				94
Investment Grade | Parent Company
Schedule of Investments [Line Items]
Available-for-sale fixed-maturity securities, amortized cost	191					191
Securities available for sale, fixed maturities, fair value	$ 203					$ 203

[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