OFFSETTING OF ASSETS AND LIABILITIES - Schedule of Derivative Instruments by Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, not subject to a master netting arrangement or similar arrangement	$ 2,576	$ 3,119
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	2,576	3,119
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, not subject to master netting arrangement	604	865
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	13	4
Net Amount	1,959	2,250
Repurchase agreements
Gross Amounts of Recognized Liabilities	1,104	437
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	1,104	437
Gross Amounts Not Offset in the Balance Sheets, Financial instruments	0	0
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	0	0
Net Amount	1,104	437
Total Liabilities
Gross Amounts of Recognized Liabilities	3,680	3,556
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	3,680	3,556
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments	604	865
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	13	4
Net Amount	3,063	2,687
Free-Standing derivatives
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, subject to master netting arrangement or similar arrangement	617	871
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	617	871
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, subject to master netting arrangement	604	865
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	13	4
Net Amount	0	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	617	871
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	617	871
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, subject to master netting arrangement	604	865
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	13	4
Net Amount	0	2
Embedded derivative - Modco reinsurance treaties
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, not subject to a master netting arrangement or similar arrangement	294	389
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	294	389
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, not subject to master netting arrangement	0	0
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	0	0
Net Amount	294	389
Funds withheld derivative
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, not subject to a master netting arrangement or similar arrangement	11	10
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	11	10
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, not subject to master netting arrangement	0	0
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	0	0
Net Amount	11	10
Embedded derivative - GLWB
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, not subject to a master netting arrangement or similar arrangement	696	960
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	696	960
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, not subject to master netting arrangement	0	0
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	0	0
Net Amount	696	960
Embedded derivative - FIA
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, not subject to a master netting arrangement or similar arrangement	631	633
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	631	633
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, not subject to master netting arrangement	0	0
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	0	0
Net Amount	631	633
Embedded derivative - IUL
Offsetting of Liabilities
Gross Amounts of Recognized Liabilities, not subject to a master netting arrangement or similar arrangement	251	201
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	251	201
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, not subject to master netting arrangement	0	0
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	0	0
Net Amount	251	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
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, not subject to master netting arrangement	0	0
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	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	1,959	2,248
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Balance Sheets	1,959	2,248
Gross Amounts Not Offset in the Balance Sheets, Financial Instruments, not subject to master netting arrangement	0	0
Gross Amounts Not Offset in the Balance Sheets, Collateral Posted	0	0
Net Amount	$ 1,959	$ 2,248