FAIR VALUE - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	$ 33,900	$ 33,750
Interest rate & other derivative — non-qualifying hedges	553	660
Interest rate & other derivative — non-qualifying hedges	541	625
Fair Value, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	33,900	33,750
Interest rate & other derivative — non-qualifying hedges	553	660
Interest rate & other derivative — non-qualifying hedges	541	625
Fair Value, Recurring | Corporate Bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	465	467
Fair Value, Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	168	168
Interest rate & other derivative — non-qualifying hedges	19	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	168	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	19	17
Interest rate & other derivative — non-qualifying hedges	$ 1	$ 1