Fair Value of Financial Instruments - Investments Held at Net Asset Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Loss on investments	$ 75	$ 83
Fair Value | Net Asset Value
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investment in limited partnership	$ 10	$ 85