Investments and Cash - Summarized Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Total assets	$ 16,843	$ 18,208
Total liabilities	11,551	11,708
Total equity	5,292	6,478	$ 6,684	$ 6,645
Total revenues	723	848	1,115
Total expenses	536	465	729
Net income (loss)	137	419	368
Equity Method Investment
Schedule of Equity Method Investments [Line Items]
Total assets	697	1,543
Total liabilities	76	412
Total equity	621	1,131
Total revenues	(315)	548	225
Total expenses	49	64	84
Net income (loss)	$ (364)	$ 484	$ 141