Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule of Investments
Investments	$ 2,073		$ 2,310
Other Segments and Holding Company
Schedule of Investments
Investments	34		38
Portion of unrealized (losses) gains that relates to equity securities still held	0	$ 0
Energy
Schedule of Investments
Investments	20		24
Equity method investments | Other Segments and Holding Company
Schedule of Investments
Investments	20		24
Held to maturity debt investments measured at amortized cost | 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