INVESTMENTS - Gross Unrealized Losses (Details) $ in Millions	Jun. 30, 2019 USD ($) security	Dec. 31, 2018 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Number of fixed maturities in an unrealized loss position greater than 12 months \| security	301	1,471
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	$ 696	$ 11,832
Less Than 12 Months, Gross Unrealized Losses	6	400
Greater than 12 Months, Fair Value	4,139	9,460
Greater Than 12 Months, Gross Unrealized Losses	102	795
Total, Fair Value	4,835	21,292
Total, Gross Unrealized Losses	108	1,195
Corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	350	8,369
Less Than 12 Months, Gross Unrealized Losses	3	306
Greater than 12 Months, Fair Value	1,697	6,161
Greater Than 12 Months, Gross Unrealized Losses	56	393
Total, Fair Value	2,047	14,530
Total, Gross Unrealized Losses	59	699
U.S. Treasury, government and agency
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	0	2,636
Less Than 12 Months, Gross Unrealized Losses	0	68
Greater than 12 Months, Fair Value	2,224	3,154
Greater Than 12 Months, Gross Unrealized Losses	38	386
Total, Fair Value	2,224	5,790
Total, Gross Unrealized Losses	38	454
State and Political Sub-divisions
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	0	0
Less Than 12 Months, Gross Unrealized Losses	0	0
Greater than 12 Months, Fair Value	0	19
Greater Than 12 Months, Gross Unrealized Losses	0	1
Total, Fair Value	0	19
Total, Gross Unrealized Losses	0	1
Foreign governments
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	2	109
Less Than 12 Months, Gross Unrealized Losses	0	3
Greater than 12 Months, Fair Value	47	76
Greater Than 12 Months, Gross Unrealized Losses	5	10
Total, Fair Value	49	185
Total, Gross Unrealized Losses	5	13
Residential mortgage-backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value		0
Less Than 12 Months, Gross Unrealized Losses		0
Greater than 12 Months, Fair Value		13
Greater Than 12 Months, Gross Unrealized Losses		0
Total, Fair Value		13
Total, Gross Unrealized Losses		0
Asset- backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	227	558
Less Than 12 Months, Gross Unrealized Losses	1	11
Greater than 12 Months, Fair Value	152	6
Greater Than 12 Months, Gross Unrealized Losses	1	0
Total, Fair Value	379	564
Total, Gross Unrealized Losses	2	11
Redeemable preferred stock
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	117	160
Less Than 12 Months, Gross Unrealized Losses	2	12
Greater than 12 Months, Fair Value	19	31
Greater Than 12 Months, Gross Unrealized Losses	2	5
Total, Fair Value	136	191
Total, Gross Unrealized Losses	$ 4	$ 17

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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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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