FAIR VALUE MEASUREMENTS - Changes in Available-For-Sale Investments and Derivatives Classified as Level 3 (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		$ 189	$ 346
Realized gains or losses included in earnings		(14)	(189)
Unrealized gains or losses included in other comprehensive income (loss)		(4)	(140)
Purchases		0	0
Issuances		0	0
Sales		(147)	(60)
Settlements		34	83
Transfers into Level 3		0	149	[1]
Transfers out of Level 3		0	0
Balance, end of period		58	189
Change in unrealized gain (losses) still held		(14)	(189)
Interest rate swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	[2]	0	1
Realized gains or losses included in earnings	[2]	0	(1)
Unrealized gains or losses included in other comprehensive income (loss)	[2]	0	0
Purchases	[2]	0	0
Issuances	[2]	0	0
Sales	[2]	0	0
Settlements	[2]	0	0
Transfers into Level 3	[2]	0	0
Transfers out of Level 3	[2]	0	0
Balance, end of period	[2]	0	0
Change in unrealized gain (losses) still held	[2]	0	(1)
Foreign currency swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	[2]	(212)	(99)
Realized gains or losses included in earnings	[2]	(15)	(191)
Unrealized gains or losses included in other comprehensive income (loss)	[2]	(1)	(17)
Purchases	[2]	0	0
Issuances	[2]	0	0
Sales	[2]	0	0
Settlements	[2]	36	95
Transfers into Level 3	[2]	0	0
Transfers out of Level 3	[2]	0	0
Balance, end of period	[2]	(192)	(212)
Change in unrealized gain (losses) still held	[2]	(15)	(191)
Credit default swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	[2]	0	(3)
Realized gains or losses included in earnings	[2]	1	3
Unrealized gains or losses included in other comprehensive income (loss)	[2]	0	0
Purchases	[2]	0	0
Issuances	[2]	0	0
Sales	[2]	0	0
Settlements	[2]	0	0
Transfers into Level 3	[2]	0	0
Transfers out of Level 3	[2]	0	0
Balance, end of period	[2]	1	0
Change in unrealized gain (losses) still held	[2]	1	3
Fixed maturities | Mortgage- and asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		223	369
Realized gains or losses included in earnings		0	0
Unrealized gains or losses included in other comprehensive income (loss)		(1)	(134)
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		(2)	(12)
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		220	223
Change in unrealized gain (losses) still held		0	0
Fixed maturities | Public utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		0	0
Realized gains or losses included in earnings		0	0
Unrealized gains or losses included in other comprehensive income (loss)		0	0
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		0	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		0	0
Change in unrealized gain (losses) still held		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	0
Realized gains or losses included in earnings		0	0
Unrealized gains or losses included in other comprehensive income (loss)		0	0
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		0	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		0	0
Change in unrealized gain (losses) still held		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	23
Realized gains or losses included in earnings		0	0
Unrealized gains or losses included in other comprehensive income (loss)		0	3
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		0	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		26	26
Change in unrealized gain (losses) still held		0	0
Fixed maturities | Other corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		0	0
Realized gains or losses included in earnings		0	0
Unrealized gains or losses included in other comprehensive income (loss)		0	0
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		0	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		0	0
Change in unrealized gain (losses) still held		0	0
Perpetual securities | Banks/financial institutions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		149	52
Realized gains or losses included in earnings		0	0
Unrealized gains or losses included in other comprehensive income (loss)		(2)	8
Purchases		0	0
Issuances		0	0
Sales		(147)	(60)
Settlements		0	0
Transfers into Level 3		0	149	[1]
Transfers out of Level 3		0	0
Balance, end of period		0	149
Change in unrealized gain (losses) still held		0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		3	3
Realized gains or losses included in earnings		0	0
Unrealized gains or losses included in other comprehensive income (loss)		0	0
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		0	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		3	3
Change in unrealized gain (losses) still held		$ 0	$ 0

[1] Due to use of estimated redemption price

[2] Derivative assets and liabilities are presented net