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				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 256		$ 3,507		$ 3,197		$ 3,803
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	64		(45)		66		50
Unrealized gains (losses) included in other comprehensive income (loss)	(30)		48		(79)		(25)
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		(400)		(290)
Settlements	(3)		(14)		(6)		(42)
Transfers into Level 3	49	[1]	0		174	[1]	0
Transfers out of Level 3	(9)	[2]	0		(2,625)	[2]	0
Balance, end of period	327		3,496		327		3,496
Change in unrealized gains (losses) still held	64		(45)		66		(1)
Fixed Maturities | Mortgage- and asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	439		367		338		394
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		(3)		0		(3)
Unrealized gains (losses) included in other comprehensive income (loss)	(28)		22		(49)		(1)
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		0		0
Settlements	(3)		(7)		(6)		(11)
Transfers into Level 3	0		0		125	[1]	0
Transfers out of Level 3	(9)	[2]	0		(9)	[2]	0
Balance, end of period	399		379		399		379
Change in unrealized gains (losses) still held	0		(3)		0		(3)
Fixed Maturities | Public Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0		409		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		9		(20)		(4)
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		418		0		418
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		418		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		18		0		2
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		436		0		436
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	26		1,097		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)		17		(2)		40
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		(997)	[2]	0
Balance, end of period	25		1,114		25		1,114
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		1,035		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		(4)		0		(42)
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		1,031		0		1,031
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	0		325		215		526
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0		49
Unrealized gains (losses) included in other comprehensive income (loss)	0		(18)		0		(12)
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	0		0		0		(256)
Settlements	0		0		0		0
Transfers into Level 3	49	[1]	0		49	[1]	0
Transfers out of Level 3	0		0		(215)	[2]	0
Balance, end of period	49		307		49		307
Change in unrealized gains (losses) still held	0		0		0		0
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	4		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)	(1)		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	25	[3]	28	[3]	29	[3]	30	[3]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(4)	[3]	(1)	[3]	(8)	[3]	(3)	[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	0	[3]	0	[3]	0	[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	21	[3]	27	[3]	21	[3]	27	[3]
Change in unrealized gains (losses) still held	(4)	[3]	(1)	[3]	(8)	[3]	(3)	[3]
Derivatives | Foreign currency swaps
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	(184)	[3]	(79)	[3]	(172)	[3]	(56)	[3]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	58	[3]	(31)	[3]	53	[3]	(18)	[3]
Unrealized gains (losses) included in other comprehensive income (loss)	0	[3]	4	[3]	(7)	[3]	(8)	[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]	(7)	[3]	0	[3]	(31)	[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	(126)	[3]	(113)	[3]	(126)	[3]	(113)	[3]
Change in unrealized gains (losses) still held	58	[3]	(31)	[3]	53	[3]	(18)	[3]
Derivatives | Credit default swaps
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	(54)	[3]	(97)	[3]	(65)	[3]	(130)	[3]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	10	[3]	(10)	[3]	21	[3]	23	[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	0	[3]	0	[3]	0	[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	(44)	[3]	(107)	[3]	(44)	[3]	(107)	[3]
Change in unrealized gains (losses) still held	$ 10	[3]	$ (10)	[3]	$ 21	[3]	$ 23	[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