INVESTMENTS - Pretax Other-Than-Temporary Impairment Losses by Investment Category (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	$ 55	$ 203
Credit-related impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0	28
Change in intent impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	54	175
Severity and duration of decline in fair value impairment
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	1
Perpetual Securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	0	140
Corporate Bonds
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	38	63
Sovereign and Supranational
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	16	0
Equity Securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses	$ 1	$ 0