LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Policyholder Account Balance And Liability For Unpaid Claims And Claims Adjustment Expense (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	$ 1,653	$ 669
Future policyholder benefits, total
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities		278
Subtotal
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	1,049
Payout-Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	340
UL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	344
Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities		58
Others
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	365	220
Other policy funds
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	604	$ 391
Unearned revenue liability	413
URL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	$ 415