DERIVATIVE FINANCIAL INSTRUMENTS - Nature and Accounting Treatment of Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Other long-term investments, Fair Value	$ 1,601	$ 1,636
Embedded derivative - Modco reinsurance treaties
Derivative [Line Items]
Other long-term investments, Fair Value	85	101
Embedded derivative - GLWB
Derivative [Line Items]
Other long-term investments, Fair Value	157	138
Embedded derivative - FIA
Derivative [Line Items]
Other long-term investments, Fair Value	65	60
Derivatives not designated as hedging instruments
Derivative [Line Items]
Other long-term investments, Notional Amounts	19,979	17,464
Other long-term investments, Fair Value	1,601	1,636
Other liabilities. Notional Amount	24,997	24,713
Other liabilities, Fair Value	2,988	3,119
Derivatives not designated as hedging instruments | Interest rate swaps
Derivative [Line Items]
Other long-term investments, Notional Amounts	1,478	1,478
Other long-term investments, Fair Value	83	185
Other liabilities. Notional Amount	1,354	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	179	158
Other long-term investments, Fair Value	6	2
Other liabilities. Notional Amount	1,027	1,003
Other liabilities, Fair Value	33	15
Derivatives not designated as hedging instruments | Embedded derivative - FIA
Derivative [Line Items]
Other long-term investments, Notional Amounts	4,181	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	1,271	1,249
Other long-term investments, Fair Value	85	101
Other liabilities. Notional Amount	2,966	2,911
Other liabilities, Fair Value	323	389
Derivatives not designated as hedging instruments | Embedded derivative - GLWB
Derivative [Line Items]
Other long-term investments, Notional Amounts	2,836	2,067
Other long-term investments, Fair Value	157	138
Other liabilities. Notional Amount	7,020	7,749
Other liabilities, Fair Value	678	960
Derivatives not designated as hedging instruments | Embedded derivative - FIA
Derivative [Line Items]
Other long-term investments, Notional Amounts	368	335
Other long-term investments, Fair Value	65	60
Other liabilities. Notional Amount	4,219	3,889
Other liabilities, Fair Value	695	633
Derivatives not designated as hedging instruments | Interest rate futures
Derivative [Line Items]
Other long-term investments, Notional Amounts	871	690
Other long-term investments, Fair Value	12	4
Other liabilities. Notional Amount	354	415
Other liabilities, Fair Value	11	3
Derivatives not designated as hedging instruments | Equity futures
Derivative [Line Items]
Other long-term investments, Notional Amounts	121	203
Other long-term investments, Fair Value	2	4
Other liabilities. Notional Amount	118	190
Other liabilities, Fair Value	2	5
Derivatives not designated as hedging instruments | Currency futures
Derivative [Line Items]
Other long-term investments, Notional Amounts	204	0
Other long-term investments, Fair Value	5	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	8,470	7,208
Other long-term investments, Fair Value	1,186	1,142
Other liabilities. Notional Amount	6,257	5,499
Other liabilities, Fair Value	905	834
Derivatives not designated as hedging instruments | Funds withheld derivative
Derivative [Line Items]
Other liabilities. Notional Amount	787	661
Other liabilities, Fair Value	13	10
Derivatives not designated as hedging instruments | Embedded derivative - IUL
Derivative [Line Items]
Other liabilities. Notional Amount	403	357
Other liabilities, Fair Value	244	201
Derivatives not designated as hedging instruments | Other
Derivative [Line Items]
Other liabilities. Notional Amount	375	304
Other liabilities, Fair Value	76	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	$ 8	$ 10