Investments - Carrying Values of Other Long-Term Investments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Other long-term investments	$ 4,076	$ 3,728
Real estate investments
Schedule of Investments [Line Items]
Other long-term investments	1,511	1,319
Securities partnerships
Schedule of Investments [Line Items]
Other long-term investments	2,360	2,166
Other
Schedule of Investments [Line Items]
Other long-term investments	$ 205	$ 243