INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	$ 5,534	$ 7,396
Less than 12 months, gross unrealized losses	134	349
12 months or longer, fair value	481	665
12 Months or Longer, Gross unrealized Losses	58	32
Fair value	6,015	8,061
Gross unrealized losses	192	381
Corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	4,063	2,669
Less than 12 months, gross unrealized losses	116	41
12 months or longer, fair value	365	366
12 Months or Longer, Gross unrealized Losses	49	20
Fair value	4,428	3,035
Gross unrealized losses	165	61
U.S. Treasury, government and agency
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value		4,245
Less than 12 months, gross unrealized losses		305
12 months or longer, fair value		2
12 Months or Longer, Gross unrealized Losses		0
Fair value		4,247
Gross unrealized losses		305
States and political subdivisions
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value		123
Less than 12 months, gross unrealized losses		3
12 months or longer, fair value		0
12 Months or Longer, Gross unrealized Losses		0
Fair value		123
Gross unrealized losses		3
Foreign governments
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	88	11
Less than 12 months, gross unrealized losses	1	0
12 months or longer, fair value	31	47
12 Months or Longer, Gross unrealized Losses	5	5
Fair value	119	58
Gross unrealized losses	6	5
Asset-backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	1,324	319
Less than 12 months, gross unrealized losses	16	0
12 months or longer, fair value	74	201
12 Months or Longer, Gross unrealized Losses	2	2
Fair value	1,398	520
Gross unrealized losses	18	2
Redeemable preferred stock
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	59	29
Less than 12 months, gross unrealized losses	1	0
12 months or longer, fair value	11	49
12 Months or Longer, Gross unrealized Losses	2	5
Fair value	70	78
Gross unrealized losses	$ 3	$ 5

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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