DERIVATIVE INSTRUMENTS - Maximum Potential Risk, Fair Value, Weighted-Average Years to Maturity, and Underlying Referenced Credit Obligation Type for Credit Default Swaps (Detail) (Corporate Bonds, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Credit Derivatives [Line Items]
Maximum potential risk	$ (83)	$ (207)
Estimated fair value	0	(3)
Less than one year
Credit Derivatives [Line Items]
Maximum potential risk	0	0
Estimated fair value	0	0
One to three years
Credit Derivatives [Line Items]
Maximum potential risk	0	(112)
Estimated fair value	0	1
Three to five years
Credit Derivatives [Line Items]
Maximum potential risk	(83)	0
Estimated fair value	0	0
Five to ten years
Credit Derivatives [Line Items]
Maximum potential risk	0	(95)
Estimated fair value	0	(4)
A
Credit Derivatives [Line Items]
Credit Rating	A	A
Maximum potential risk	(83)	(112)
Estimated fair value	0	1
A | Less than one year
Credit Derivatives [Line Items]
Maximum potential risk	0	0
Estimated fair value	0	0
A | One to three years
Credit Derivatives [Line Items]
Maximum potential risk	0	(112)
Estimated fair value	0	1
A | Three to five years
Credit Derivatives [Line Items]
Maximum potential risk	(83)	0
Estimated fair value	0	0
A | Five to ten years
Credit Derivatives [Line Items]
Maximum potential risk	0	0
Estimated fair value	0	0
BBB
Credit Derivatives [Line Items]
Credit Rating		BBB
Maximum potential risk		(95)
Estimated fair value		(4)
BBB | Less than one year
Credit Derivatives [Line Items]
Maximum potential risk		0
Estimated fair value		0
BBB | One to three years
Credit Derivatives [Line Items]
Maximum potential risk		0
Estimated fair value		0
BBB | Three to five years
Credit Derivatives [Line Items]
Maximum potential risk		0
Estimated fair value		0
BBB | Five to ten years
Credit Derivatives [Line Items]
Maximum potential risk		(95)
Estimated fair value		$ (4)