Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Schedule of Investments
Investments	$ 2,306		$ 2,306		$ 3,012
Other Segments and Holding Company
Schedule of Investments
Investments	110		110		114
Portion of unrealized (losses) gains that relates to equity securities still held	0	$ 0	0	$ 0
Equity method investments | Other Segments and Holding Company
Schedule of Investments
Investments	96		96		100
Held to maturity debt investments measured at amortized cost | Other Segments and Holding Company
Schedule of Investments
Investments	11		11		11
Other investments measured at fair value | Other Segments and Holding Company
Schedule of Investments
Investments	$ 3		$ 3		$ 3