FAIR VALUE MEASUREMENTS - Additional Information (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Measurement Inputs, Disclosure [Line Items]
Securities held to maturity, fixed maturities, fair value	$ 54,841,000,000	$ 46,383,000,000
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0	0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0	0
Interest Rates
Fair Value, Measurement Inputs, Disclosure [Line Items]
Magnitude of movement	0.50%
Credit Spreads
Fair Value, Measurement Inputs, Disclosure [Line Items]
Magnitude of movement	0.50%
Interest Rate Volatility
Fair Value, Measurement Inputs, Disclosure [Line Items]
Magnitude of movement	50.00%
Discounted cash flow valuation technique
Fair Value, Measurement Inputs, Disclosure [Line Items]
Fair values of available-for-sale fixed maturity and perpetual securities valued by our DCF pricing model	16,400,000,000
Securities held to maturity, fixed maturities, fair value	$ 21,100,000,000