DERIVATIVE INSTRUMENTS - Gains (Losses) Recognized on Fair Value Hedging Relationships (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized for derivatives		$ (2)	$ 4	$ (18)	$ 8
Gains (losses) on derivatives excluded from effectiveness testing	[1]	(2)	(16)	(9)	(31)
Gains (losses) on derivatives included in effectiveness testing	[2]	0	20	(9)	39
Gains (losses) recognized for hedged items	[2]	0	(21)	10	(39)
Net realized gains (losses) recognized for fair value hedge		0	(1)	1	0
Fixed maturity securities | Foreign currency forwards
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized for derivatives		0	6	(16)	15
Gains (losses) on derivatives excluded from effectiveness testing	[1]	(1)	(14)	(8)	(24)
Gains (losses) on derivatives included in effectiveness testing	[2]	1	20	(8)	39
Gains (losses) recognized for hedged items	[2]	(1)	(21)	9	(39)
Net realized gains (losses) recognized for fair value hedge		0	(1)	1	0
Fixed maturity securities | Foreign currency options
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized for derivatives		(2)		(2)	(4)
Gains (losses) on derivatives excluded from effectiveness testing	[1]	(1)		(1)	(4)
Gains (losses) on derivatives included in effectiveness testing	[2]	(1)		(1)	0
Gains (losses) recognized for hedged items	[2]	1		1	0
Net realized gains (losses) recognized for fair value hedge		$ 0		$ 0	0
Fixed maturity securities | Interest rate swaptions
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized for derivatives			(2)		(3)
Gains (losses) on derivatives excluded from effectiveness testing	[1]		(2)		(3)
Gains (losses) on derivatives included in effectiveness testing	[2]		0		0
Gains (losses) recognized for hedged items	[2]		0		0
Net realized gains (losses) recognized for fair value hedge			$ 0		$ 0

[1] Gains (losses) excluded from effectiveness testing includes the forward point on foreign currency forwards and time value change on foreign currency options which are reported in the consolidated statement of earnings as net investment gains (losses). It also includes the change in the fair value of the interest rate swaptions related to the time value of the swaptions which is recognized as a component of other comprehensive income (loss).

[2] Gains and losses on foreign currency forwards and options and related hedged items are reported in the consolidated statement of earnings as net investment gains (losses). For interest rate swaptions and related hedged items, gains and losses included in the hedge assessment, premium amortization and time value amortization while the hedge items are still outstanding are reported within net investment income. The time value gains and losses for interest rate swaptions when the related hedged items are redeemed are reported in net investment gains and losses consistent with the impact of the hedged item. For the three-month and six-month periods ended June 30, 2020 and 2019, gains and losses included in the hedge assessment on interest rate swaptions and related hedged items were immaterial.