Investments - Other Long-Term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Other long term investments, including held for sale assets	$ 4,301	$ 4,181
Real estate investments
Schedule of Investments [Line Items]
Other long-term investments	1,696	1,606
Securities partnerships
Schedule of Investments [Line Items]
Other long-term investments	2,423	2,400
Other
Schedule of Investments [Line Items]
Other long term investments, including held for sale assets	$ 182	$ 175