FAIR VALUE - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	$ 24,915	$ 19,936
Interest rate & other derivative — non-qualifying hedges	659	640
Fair value of derivative financial instruments	654	636
Fair Value, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	24,915	19,936
Interest rate & other derivative — non-qualifying hedges	659	640
Fair value of derivative financial instruments	654	636
Fair Value, Recurring | Corporate Bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	487	482
Fair Value, Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	161	157
Interest rate & other derivative — non-qualifying hedges	9	7
Fair value of derivative financial instruments	1	1
Fair Value, Recurring | Level 3 | Corporate Bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	161	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	9	7
Fair value of derivative financial instruments	$ 1	$ 1