FAIR VALUE MEASUREMENTS - Changes in Available-For-Sale Investments and Derivatives Classified as Level 3 (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 327		$ 3,496		$ 3,197		$ 3,803
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	52		81		118		131
Unrealized gains (losses) included in other comprehensive income (loss)	10		303		(69)		278
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	13		0		(387)		(290)
Settlements	(3)		(7)		(9)		(49)
Transfers into Level 3	0		206		174	[1]	206
Transfers out of Level 3	0		0		(2,625)	[2]	0
Balance, end of period	399		4,079		399		4,079
Change in unrealized gains (losses) still held	52		81		118		80
Fixed Maturities | Mortgage- and asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	399		379		338		394
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0		(3)
Unrealized gains (losses) included in other comprehensive income (loss)	7		11		(42)		10
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		0		0
Settlements	(3)		(5)		(9)		(16)
Transfers into Level 3	0		0		125	[1]	0
Transfers out of Level 3	0		0		(9)	[2]	0
Balance, end of period	403		385		403		385
Change in unrealized gains (losses) still held	0		0		0		(3)
Fixed Maturities | Public Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0		418		420		422
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0		0
Unrealized gains (losses) included in other comprehensive income (loss)	0		31		(20)		27
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		(400)		0
Settlements	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Balance, end of period	0		449		0		449
Change in unrealized gains (losses) still held	0		0		0		0
Fixed Maturities | Sovereign and Supranational
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0		436		418		434
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0		0
Unrealized gains (losses) included in other comprehensive income (loss)	0		24		0		26
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		0		0
Settlements	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		(418)	[2]	0
Balance, end of period	0		460		0		460
Change in unrealized gains (losses) still held	0		0		0		0
Fixed Maturities | Banks/financial Institutions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	25		1,114		1,024		1,074
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0		0
Unrealized gains (losses) included in other comprehensive income (loss)	(1)		103		(3)		143
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		0		0
Settlements	0		0		0		0
Transfers into Level 3	0		206	[1]	0		206	[1]
Transfers out of Level 3	0		0		(997)	[2]	0
Balance, end of period	24		1,423		24		1,423
Change in unrealized gains (losses) still held	0		0		0		0
Fixed Maturities | Other Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0		1,031		986		1,105
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0		2
Unrealized gains (losses) included in other comprehensive income (loss)	0		42		0		0
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		0		(34)
Settlements	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		(986)	[2]	0
Balance, end of period	0		1,073		0		1,073
Change in unrealized gains (losses) still held	0		0		0		0
Perpetual Securities | Banks/financial Institutions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	49		307		215		526
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		(27)		0		22
Unrealized gains (losses) included in other comprehensive income (loss)	2		90		2		78
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		0		(256)
Settlements	0		0		0		0
Transfers into Level 3	0		0		49	[1]	0
Transfers out of Level 3	0		0		(215)	[2]	0
Balance, end of period	51		370		51		370
Change in unrealized gains (losses) still held	0		(27)		0		(27)
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	3		4		4		4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0		0
Unrealized gains (losses) included in other comprehensive income (loss)	0		0		(1)		0
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		0		0
Settlements	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Balance, end of period	3		4		3		4
Change in unrealized gains (losses) still held	0		0		0		0
Derivatives | Interest rate swaps
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	21	[3]	27	[3]	29	[3]	30	[3]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(1)	[3]	7	[3]	(9)	[3]	4	[3]
Unrealized gains (losses) included in other comprehensive income (loss)	0	[3]	0	[3]	0	[3]	0	[3]
Purchases	0	[3]	0	[3]	0	[3]	0	[3]
Issuances	0	[3]	0	[3]	0	[3]	0	[3]
Sales	(20)	[3]	0	[3]	(20)	[3]	0	[3]
Settlements	0	[3]	0	[3]	0	[3]	0	[3]
Transfers into Level 3	0	[3]	0	[3]	0	[3]	0	[3]
Transfers out of Level 3	0	[3]	0	[3]	0	[3]	0	[3]
Balance, end of period	0	[3]	34	[3]	0	[3]	34	[3]
Change in unrealized gains (losses) still held	(1)	[3]	7	[3]	(9)	[3]	4	[3]
Derivatives | Foreign currency swaps
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	(126)	[3]	(113)	[3]	(172)	[3]	(56)	[3]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	49	[3]	76	[3]	102	[3]	58	[3]
Unrealized gains (losses) included in other comprehensive income (loss)	2	[3]	2	[3]	(5)	[3]	(6)	[3]
Purchases	0	[3]	0	[3]	0	[3]	0	[3]
Issuances	0	[3]	0	[3]	0	[3]	0	[3]
Sales	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	0	[3]	(2)	[3]	0	[3]	(33)	[3]
Transfers into Level 3	0	[3]	0	[3]	0	[3]	0	[3]
Transfers out of Level 3	0	[3]	0	[3]	0	[3]	0	[3]
Balance, end of period	(75)	[3]	(37)	[3]	(75)	[3]	(37)	[3]
Change in unrealized gains (losses) still held	49	[3]	76	[3]	102	[3]	58	[3]
Derivatives | Credit default swaps
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	(44)	[3]	(107)	[3]	(65)	[3]	(130)	[3]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	4	[3]	25	[3]	25	[3]	48	[3]
Unrealized gains (losses) included in other comprehensive income (loss)	0	[3]	0	[3]	0	[3]	0	[3]
Purchases	0	[3]	0	[3]	0	[3]	0	[3]
Issuances	0	[3]	0	[3]	0	[3]	0	[3]
Sales	33	[3]	0	[3]	33	[3]	0	[3]
Settlements	0	[3]	0	[3]	0	[3]	0	[3]
Transfers into Level 3	0	[3]	0	[3]	0	[3]	0	[3]
Transfers out of Level 3	0	[3]	0	[3]	0	[3]	0	[3]
Balance, end of period	(7)	[3]	(82)	[3]	(7)	[3]	(82)	[3]
Change in unrealized gains (losses) still held	$ 4	[3]	$ 25	[3]	$ 25	[3]	$ 48	[3]

[1] Due to a lack of visibility to observe significant inputs to price

[2] A result of changing our pricing methodology to a valuation method that uses observable market data as significant inputs to estimate fair value

[3] Derivative assets and liabilities are presented net