POLICYHOLDER ACCOUNT BALANCES - Aggregate Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 139,161	$ 136,544
Equity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	1,517	1,438
Fixed-maturity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	1,253	1,284
Mutual funds and other investments
Policyholder Account Balance [Line Items]
Separate Accounts assets	136,391	133,822
Retirement
Policyholder Account Balance [Line Items]
Separate Accounts assets	86,051	83,570
Retirement \| Equity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	648	568
Retirement \| Fixed-maturity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	18	24
Retirement \| Mutual funds and other investments
Policyholder Account Balance [Line Items]
Separate Accounts assets	85,385	82,978
Corporate & Other \| Legacy
Policyholder Account Balance [Line Items]
Separate Accounts assets	26,970	28,276
Corporate & Other \| Legacy \| Equity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	0	0
Corporate & Other \| Legacy \| Fixed-maturity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	0	0
Corporate & Other \| Legacy \| Mutual funds and other investments
Policyholder Account Balance [Line Items]
Separate Accounts assets	26,970	28,276
Corporate & Other \| Life
Policyholder Account Balance [Line Items]
Separate Accounts assets	22,553	21,077
Corporate & Other \| Life \| Equity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	71	65
Corporate & Other \| Life \| Fixed-maturity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	130	134
Corporate & Other \| Life \| Mutual funds and other investments
Policyholder Account Balance [Line Items]
Separate Accounts assets	22,352	20,878
Corporate & Other \| Other
Policyholder Account Balance [Line Items]
Separate Accounts assets	3,587	3,621
Corporate & Other \| Other \| Equity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	798	805
Corporate & Other \| Other \| Fixed-maturity securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	1,105	1,126
Corporate & Other \| Other \| Mutual funds and other investments
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 1,684	$ 1,690