FAIR VALUE MEASUREMENTS - Changes in Available-For-Sale Investments and Derivatives Classified as Level 3 (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		$ 58	$ 189
Realized investment gains (losses) included in earnings		126	(82)
Unrealized gains (losses) included in other comprehensive income (loss)		25	(4)
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		(4)	15
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		205	118
Change in unrealized gains (losses) still held		126	(82)
Interest rate swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	[1]	0	0
Realized gains or losses included in earnings	[1]	0	0
Unrealized gains or losses included in other comprehensive income (loss)	[1]	0	0
Purchases	[1]	0	0
Issuances	[1]	0	0
Sales	[1]	0	0
Settlements	[1]	0	0
Transfers into Level 3	[1]	0	0
Transfers out of Level 3	[1]	0	0
Balance, end of period	[1]	0	0
Changes in unrealized gain (losses) still held	[1]	0	0
Foreign currency swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	[1]	(192)	(212)
Realized gains or losses included in earnings	[1]	125	(83)
Unrealized gains or losses included in other comprehensive income (loss)	[1]	4	(4)
Purchases	[1]	0	0
Issuances	[1]	0	0
Sales	[1]	0	0
Settlements	[1]	0	16
Transfers into Level 3	[1]	0	0
Transfers out of Level 3	[1]	0	0
Balance, end of period	[1]	(63)	(283)
Changes in unrealized gain (losses) still held	[1]	125	(83)
Credit default swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	[1]	1	0
Realized gains or losses included in earnings	[1]	1	1
Unrealized gains or losses included in other comprehensive income (loss)	[1]	0	0
Purchases	[1]	0	0
Issuances	[1]	0	0
Sales	[1]	0	0
Settlements	[1]	0	0
Transfers into Level 3	[1]	0	0
Transfers out of Level 3	[1]	0	0
Balance, end of period	[1]	2	1
Changes in unrealized gain (losses) still held	[1]	1	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		220	223
Realized investment gains (losses) included in earnings		0	0
Unrealized gains (losses) included in other comprehensive income (loss)		21	(1)
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		(4)	(1)
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		237	221
Change in unrealized gains (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 investment gains (losses) included in earnings		0	0
Unrealized gains (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 gains (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 investment gains (losses) included in earnings		0	0
Unrealized gains (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 gains (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	26
Realized investment gains (losses) included in earnings		0	0
Unrealized gains (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		26	26
Change in unrealized gains (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 investment gains (losses) included in earnings		0	0
Unrealized gains (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 gains (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		0	149
Realized investment gains (losses) included in earnings		0	0
Unrealized gains (losses) included in other comprehensive income (loss)		0	1
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	150
Change in unrealized gains (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 investment gains (losses) included in earnings		0	0
Unrealized gains (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 gains (losses) still held		$ 0	$ 0

[1] Derivative assets and liabilities are presented net