POLICYHOLDER ACCOUNT BALANCES - Reconciliation of Separate Account Liabilities to Separate Account Liability balance (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	$ 124,569	$ 134,717	$ 137,407
Protection Solutions \| Variable Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	17,464	18,176		$ 17,007	$ 15,821
Legacy Segment \| GMxB Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	27,408	33,199		34,860	33,794
Individual Retirement \| GMxB Core
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	29,201	30,411		30,820	29,829
Individual Retirement \| EQUI-VEST Individual
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	4,444	4,782		4,826	4,582
Individual Retirement \| Investment Edge
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	4,720	4,885		4,524	4,275
Group Retirement \| EQUI-VEST Group
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	29,229	30,546		29,018	26,959
Group Retirement \| Momentum
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	4,637	4,813		$ 4,706	$ 4,421
Other
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	$ 7,466	$ 7,905