FAIR VALUE - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	$ 28,190	$ 19,936
Interest rate & other derivative — non-qualifying hedges	553	640
Interest rate & other derivative — non-qualifying hedges	507	636
Fair Value, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	28,190	19,936
Interest rate & other derivative — non-qualifying hedges	553	640
Interest rate & other derivative — non-qualifying hedges	507	636
Fair Value, Recurring | Corporate Bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	477	482
Fair Value, Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	164	157
Interest rate & other derivative — non-qualifying hedges	15	7
Interest rate & other derivative — non-qualifying hedges	1	1
Fair Value, Recurring | Level 3 | Corporate Bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	164	157
Fair Value, Recurring | Level 3 | Interest Rate and Other Derivative
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate & other derivative — non-qualifying hedges	15	7
Interest rate & other derivative — non-qualifying hedges	$ 1	$ 1