FAIR VALUE MEASUREMENTS - Changes in Available-For-Sale Investments and Derivatives Classified as Level 3 (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		$ 58	$ 189
Realized gains or losses included in earnings		195	(14)
Unrealized gains or losses included in other comprehensive income (loss)		15	(4)
Purchases		16	0
Issuances		0	0
Sales		0	(147)
Settlements		(61)	34
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		223	58
Change in unrealized gain (losses) still held		195	(14)
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]	194	(15)
Unrealized gains or losses included in other comprehensive income (loss)	[1]	(22)	(1)
Purchases	[1]	0	0
Issuances	[1]	0	0
Sales	[1]	0	0
Settlements	[1]	(1)	36
Transfers into Level 3	[1]	0	0
Transfers out of Level 3	[1]	0	0
Balance, end of period	[1]	(21)	(192)
Change in unrealized gain (losses) still held	[1]	194	(15)
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
Change 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 gains or losses included in earnings		0	0
Unrealized gains or losses included in other comprehensive income (loss)		38	(1)
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		(60)	(2)
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		198	220
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
Realized gains or losses included in earnings		0
Unrealized gains or losses included in other comprehensive income (loss)		0
Purchases		16
Issuances		0
Sales		0
Settlements		0
Transfers into Level 3		0
Transfers out of Level 3		0
Balance, end of period		16	0
Change in unrealized gain (losses) still held		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 gains or losses included in earnings		0	0
Unrealized gains or losses included in other comprehensive income (loss)		(1)	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		25	26
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		0	149
Realized gains or losses included in earnings			0
Unrealized gains or losses included in other comprehensive income (loss)			(2)
Purchases			0
Issuances			0
Sales			(147)
Settlements			0
Transfers into Level 3			0
Transfers out of Level 3			0
Balance, end of period			0
Change in unrealized gain (losses) still held			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] Derivative assets and liabilities are presented net