Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments
Investments	$ 3,012	$ 6,809
Other Segments and Holding Company
Schedule of Investments
Investments	114	90
Portion of unrealized (losses) gains that relates to equity securities still held	0	61	$ 61
Equity method investments | Other Segments and Holding Company
Schedule of Investments
Investments	100	76
Held-to-maturity Securities [Member] | Other Segments and Holding Company
Schedule of Investments
Investments	11	11
Other investments measured at fair value | Other Segments and Holding Company
Schedule of Investments
Investments	$ 3	$ 3