FAIR VALUE - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	$ 34,963	$ 33,750
Interest rate & other derivative — non-qualifying hedges	570	660
Interest rate & other derivative — non-qualifying hedges	520	625
Fair Value, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	34,963	33,750
Interest rate & other derivative — non-qualifying hedges	570	660
Interest rate & other derivative — non-qualifying hedges	520	625
Fair Value, Recurring | Corporate Bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	250	467
Fair Value, Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	109	168
Interest rate & other derivative — non-qualifying hedges	25	17
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	109	168
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	25	17
Interest rate & other derivative — non-qualifying hedges	$ 1	$ 1