DERIVATIVE FINANCIAL INSTRUMENTS - Nature and Accounting Treatment of Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Other long-term investments, Fair Value	$ 1,624	$ 1,636
Embedded derivative - Modco reinsurance treaties
Derivative [Line Items]
Other long-term investments, Fair Value	68	101
Embedded derivative - GLWB
Derivative [Line Items]
Other long-term investments, Fair Value	161	138
Embedded derivative - FIA
Derivative [Line Items]
Other long-term investments, Fair Value	60	60
Derivatives not designated as hedging instruments
Derivative [Line Items]
Other long-term investments, Notional Amounts	20,210	17,464
Other long-term investments, Fair Value	1,624	1,636
Other liabilities. Notional Amount	24,029	24,713
Other liabilities, Fair Value	2,651	3,119
Derivatives not designated as hedging instruments | Interest rate swaps
Derivative [Line Items]
Other long-term investments, Notional Amounts	1,448	1,478
Other long-term investments, Fair Value	104	185
Other liabilities. Notional Amount	1,384	1,354
Other liabilities, Fair Value	0	0
Derivatives not designated as hedging instruments | Total return swaps
Derivative [Line Items]
Other long-term investments, Notional Amounts	361	158
Other long-term investments, Fair Value	8	2
Other liabilities. Notional Amount	926	1,003
Other liabilities, Fair Value	13	15
Derivatives not designated as hedging instruments | Embedded derivative - FIA
Derivative [Line Items]
Other long-term investments, Notional Amounts	4,272	4,076
Other long-term investments, Fair Value	0	0
Derivatives not designated as hedging instruments | Embedded derivative - Modco reinsurance treaties
Derivative [Line Items]
Other long-term investments, Notional Amounts	1,478	1,249
Other long-term investments, Fair Value	68	101
Other liabilities. Notional Amount	2,691	2,911
Other liabilities, Fair Value	229	389
Derivatives not designated as hedging instruments | Funds withheld derivative
Derivative [Line Items]
Other liabilities. Notional Amount	770	661
Other liabilities, Fair Value	12	10
Derivatives not designated as hedging instruments | Embedded derivative - GLWB
Derivative [Line Items]
Other long-term investments, Notional Amounts	3,073	2,067
Other long-term investments, Fair Value	161	138
Other liabilities. Notional Amount	6,744	7,749
Other liabilities, Fair Value	579	960
Derivatives not designated as hedging instruments | Embedded derivative - FIA
Derivative [Line Items]
Other long-term investments, Notional Amounts	355	335
Other long-term investments, Fair Value	60	60
Other liabilities. Notional Amount	4,084	3,889
Other liabilities, Fair Value	643	633
Derivatives not designated as hedging instruments | Embedded derivative - IUL
Derivative [Line Items]
Other liabilities. Notional Amount	379	357
Other liabilities, Fair Value	179	201
Derivatives not designated as hedging instruments | Interest rate futures
Derivative [Line Items]
Other long-term investments, Notional Amounts	990	690
Other long-term investments, Fair Value	20	4
Other liabilities. Notional Amount	383	415
Other liabilities, Fair Value	15	3
Derivatives not designated as hedging instruments | Equity futures
Derivative [Line Items]
Other long-term investments, Notional Amounts	146	203
Other long-term investments, Fair Value	2	4
Other liabilities. Notional Amount	106	190
Other liabilities, Fair Value	2	5
Derivatives not designated as hedging instruments | Currency futures
Derivative [Line Items]
Other long-term investments, Notional Amounts	200	0
Other long-term investments, Fair Value	3	0
Other liabilities. Notional Amount	0	264
Other liabilities, Fair Value	0	4
Derivatives not designated as hedging instruments | Equity options
Derivative [Line Items]
Other long-term investments, Notional Amounts	7,887	7,208
Other long-term investments, Fair Value	1,198	1,142
Other liabilities. Notional Amount	6,107	5,499
Other liabilities, Fair Value	916	834
Derivatives not designated as hedging instruments | Other
Derivative [Line Items]
Other liabilities. Notional Amount	338	304
Other liabilities, Fair Value	56	55
Derivatives designated as hedging instrument | Cash flow hedges | Foreign currency swaps
Derivative [Line Items]
Other liabilities. Notional Amount	117	117
Other liabilities, Fair Value	$ 7	$ 10