Investments - Carrying Values of Other Long-Term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Other long term investments	$ 3,845	$ 3,574
Real estate investments
Schedule of Investments [Line Items]
Other long term investments	1,212	1,152
Securities partnerships
Schedule of Investments [Line Items]
Other long term investments	2,463	2,272
Other
Schedule of Investments [Line Items]
Other long term investments	$ 170	$ 150