FAIR VALUE OF ASSETS AND LIABILITIES - Gains and Losses Resulting from Changes in Fair Value (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Mar. 31, 2022	Jun. 30, 2023
Future policy benefits
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		$ 715
Unrealized gains (losses) for liabilities still held		686
Policyholders' account balances
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		124
Unrealized gains (losses) for liabilities still held		89
Realized investment gains (losses), net | Future policy benefits
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		715
Unrealized gains (losses) for liabilities still held		686
Realized investment gains (losses), net | Policyholders' account balances
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		124
Unrealized gains (losses) for liabilities still held		89
Other income (loss) | Future policy benefits
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for liabilities still held		0
Other income (loss) | Policyholders' account balances
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for liabilities still held		0
Included in other comprehensive income (loss) | Future policy benefits
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for liabilities still held		0
Included in other comprehensive income (loss) | Policyholders' account balances
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for liabilities still held		0
Net investment income | Future policy benefits
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Net investment income | Policyholders' account balances
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Fixed maturity securities | Realized investment gains (losses), net | Fixed Maturity, Available-For Sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for assets still held		0
Fixed maturity securities | Other income (loss) | Fixed Maturity, Available-For Sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for assets still held		0
Fixed maturity securities | Included in other comprehensive income (loss) | Fixed Maturity, Available-For Sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		(12)
Unrealized gains (losses) for assets still held		(12)
Fixed maturity securities | Net investment income | Fixed Maturity, Available-For Sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Other assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		(21)
Unrealized gains (losses) for assets still held		(6)
Other assets | Realized investment gains (losses), net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		(21)
Unrealized gains (losses) for assets still held		(6)
Other assets | Other income (loss)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for assets still held		0
Other assets | Included in other comprehensive income (loss)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for assets still held		0
Other assets | Net investment income
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Reinsurance recoverables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)	$ (47)	201	$ (35)
Unrealized gains (losses) for assets still held	$ 0	222	$ 0
Reinsurance recoverables | Realized investment gains (losses), net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		201
Unrealized gains (losses) for assets still held		222
Reinsurance recoverables | Other income (loss)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for assets still held		0
Reinsurance recoverables | Included in other comprehensive income (loss)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		0
Unrealized gains (losses) for assets still held		0
Reinsurance recoverables | Net investment income
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total realized and unrealized gains (losses)		$ 0