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Investments - Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Schedule of Investments
Investments	$ 2,037		$ 2,037		$ 2,310
Securities sold, not yet purchased, at fair value	1,434		1,434		1,373
Investment Segment
Schedule of Investments
Investments	1,931		1,931		2,272
Securities sold, not yet purchased, at fair value	1,434		1,434		1,373
Portion of unrealized (losses) gains that relates to equity and debt securities still held	57	$ 101	(120)	$ (229)
Investment Segment | Equity securities
Schedule of Investments
Equity securities	1,931		1,931		2,241
Securities sold, not yet purchased, at fair value	1,434		1,434		1,153
Investment Segment | Communications
Schedule of Investments
Equity securities	388		388		129
Investment Segment | Consumer, cyclical
Schedule of Investments
Equity securities	98		98		277
Investment Segment | Energy
Schedule of Investments
Equity securities	55		55		57
Securities sold, not yet purchased, at fair value	833		833		460
Investment Segment | Utilities
Schedule of Investments
Equity securities	608		608		792
Securities sold, not yet purchased, at fair value	543		543		453
Investment Segment | Healthcare
Schedule of Investments
Equity securities	94		94		482
Investment Segment | Materials
Schedule of Investments
Equity securities	293		293		317
Securities sold, not yet purchased, at fair value					133
Investment Segment | Industrial
Schedule of Investments
Equity securities	395		395		187
Securities sold, not yet purchased, at fair value	$ 58		$ 58		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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