OFFSETTING OF ASSETS AND LIABILITIES - Schedule of Derivative Instruments by Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Not subject to a master netting arrangement or similar arrangement	$ 2,988	$ 3,119
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	2,988	3,119
Derivative Liability, Not Subject to Master Netting Arrangement Deduction, financial instruments	944	865
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	13	4
Net Amount	2,031	2,250
Repurchase agreements
Gross Amounts of Recognized Liabilities	1,003	437
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	1,003	437
Gross Amounts Not Offset in the Statement of Financial Position, Financial instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	0	0
Net Amount	1,003	437
Total Liabilities
Gross Amounts of Recognized Liabilities	3,991	3,556
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	3,991	3,556
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	944	865
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	13	4
Net Amount	3,034	2,687
Free-Standing derivatives
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Subject to master netting arrangement or similar arrangement	959	871
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	959	871
Derivative Liability, Not Offset, Policy election deduction, financial instruments	944	865
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	13	4
Net Amount	2	2
Total derivatives, subject to a master netting arrangement or similar arrangement
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Subject to master netting arrangement or similar arrangement	959	871
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	959	871
Derivative Liability, Not Offset, Policy election deduction, financial instruments	944	865
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	13	4
Net Amount	2	2
Embedded derivative - Modco reinsurance treaties
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Not subject to a master netting arrangement or similar arrangement	323	389
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	323	389
Derivative Liability, Not Subject to Master Netting Arrangement Deduction, financial instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	0	0
Net Amount	323	389
Funds withheld derivative
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Not subject to a master netting arrangement or similar arrangement	13	10
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	13	10
Derivative Liability, Not Subject to Master Netting Arrangement Deduction, financial instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	0	0
Net Amount	13	10
Embedded derivative - GLWB
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Not subject to a master netting arrangement or similar arrangement	678	960
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	678	960
Derivative Liability, Not Subject to Master Netting Arrangement Deduction, financial instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	0	0
Net Amount	678	960
Embedded derivative - FIA
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Not subject to a master netting arrangement or similar arrangement	695	633
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	695	633
Derivative Liability, Not Subject to Master Netting Arrangement Deduction, financial instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	0	0
Net Amount	695	633
Embedded derivative - IUL
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Not subject to a master netting arrangement or similar arrangement	244	201
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	244	201
Derivative Liability, Not Subject to Master Netting Arrangement Deduction, financial instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	0	0
Net Amount	244	201
Other
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Not subject to a master netting arrangement or similar arrangement	76	55
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	76	55
Derivative Liability, Not Subject to Master Netting Arrangement Deduction, financial instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	0	0
Net Amount	76	55
Total derivatives, not subject to a master netting arrangement or similar arrangement
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, Not subject to a master netting arrangement or similar arrangement	2,029	2,248
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	2,029	2,248
Derivative Liability, Not Subject to Master Netting Arrangement Deduction, financial instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash collateral paid	0	0
Net Amount	$ 2,029	$ 2,248