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Investments - Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Schedule of Investments
Investments	$ 1,972		$ 1,972		$ 2,310
Securities sold, not yet purchased, at fair value	996		996		1,373
Investment Segment
Schedule of Investments
Investments	1,939		1,939		2,272
Securities sold, not yet purchased, at fair value	996		996		1,373
Portion of unrealized (losses) gains that relates to equity and debt securities still held	11	$ (86)	(204)	$ (360)
Investment Segment | Equity securities
Schedule of Investments
Equity securities	1,939		1,939		2,241
Securities sold, not yet purchased, at fair value	996		996		1,153
Investment Segment | Communications
Schedule of Investments
Equity securities	171		171		129
Investment Segment | Consumer, cyclical
Schedule of Investments
Equity securities	91		91		277
Investment Segment | Energy
Schedule of Investments
Equity securities	52		52		57
Securities sold, not yet purchased, at fair value	452		452		460
Investment Segment | Utilities
Schedule of Investments
Equity securities	685		685		792
Securities sold, not yet purchased, at fair value	544		544		453
Investment Segment | Healthcare
Schedule of Investments
Equity securities	378		378		482
Investment Segment | Materials
Schedule of Investments
Equity securities	276		276		317
Securities sold, not yet purchased, at fair value					133
Investment Segment | Industrial
Schedule of Investments
Equity securities	$ 286		$ 286		187
Securities sold, not yet purchased, at fair value					107
Investment Segment | Debt securities
Schedule of Investments
Debt Securities					31
Investment Segment | Real Estate
Schedule of Investments
Debt Securities					31
Investment Segment | Communications
Schedule of Investments
Debt Securities					$ 220

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