INVESTMENTS - SUCCESSOR COMPANY - Other Invested Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	$ 450	$ 106
Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	440
Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	10
Partnership Interest
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets		91
Partnership Interest | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	354	10
Partnership Interest | Fair Value | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	344
Partnership Interest | Fair Value | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	10
Private equity | Partnership Interest | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	345	4
Private equity | Partnership Interest | Fair Value | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	344
Private equity | Partnership Interest | Fair Value | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	1
Real estate-related | Partnership Interest | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets		6
Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	85	3
Derivatives | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	85
Derivatives | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0
Policy loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	11	12
Policy loans | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	11
Policy loans | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0
Equity Method Investments | Partnership Interest
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	9	81
Equity Method Investments | Partnership Interest | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0
Equity Method Investments | Partnership Interest | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	9
Equity Method Investments | Private equity | Partnership Interest
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	4	19
Equity Method Investments | Private equity | Partnership Interest | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0
Equity Method Investments | Private equity | Partnership Interest | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	4
Equity Method Investments | Real estate-related | Partnership Interest
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	5	$ 62
Equity Method Investments | Real estate-related | Partnership Interest | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0
Equity Method Investments | Real estate-related | Partnership Interest | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	$ 5