Fair Value - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	$ 11,894	$ 8,995
Interest rate & other derivative — non-qualifying hedges	758	159
Fair value of derivative financial instruments	825	486
Fair Value, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	11,894	8,995
Interest rate & other derivative — non-qualifying hedges	758	159
Fair value of derivative financial instruments	825	486
Fair Value, Recurring | Corporate bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	476	536
Fair Value, Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	151	174
Interest rate & other derivative — non-qualifying hedges	3	0
Fair value of derivative financial instruments	1	0
Fair Value, Recurring | Level 3 | Corporate bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	$ 151	$ 174