Fair Value - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	$ 8,995	$ 9,203
Fair Value, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	8,995	9,203
Fair Value, Recurring | Corporate bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	536	608
Fair Value, Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	174	207
Fair Value, Recurring | Level 3 | Corporate bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate bonds	$ 174	$ 207