Investments - Investment Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Schedule of Investments
Securities sold, not yet purchased, at fair value	$ 1,382	$ 1,373
Investment Segment
Schedule of Investments
Securities sold, not yet purchased, at fair value	1,382	1,373
Portion of unrealized gains and (losses) that relates to equity and debt securities still held	140	(187)	$ (302)
Investment Segment | Equity securities
Schedule of Investments
Equity securities	2,146	2,241
Securities sold, not yet purchased, at fair value	1,382	1,153
Investment Segment | Communications
Schedule of Investments
Equity securities	371	129
Investment Segment | Consumer, cyclical
Schedule of Investments
Equity securities	180	277
Investment Segment | Energy
Schedule of Investments
Equity securities	71	57
Securities sold, not yet purchased, at fair value	798	460
Investment Segment | Utilities
Schedule of Investments
Equity securities	622	792
Securities sold, not yet purchased, at fair value	525	453
Investment Segment | Healthcare
Schedule of Investments
Equity securities	99	482
Investment Segment | Materials
Schedule of Investments
Equity securities	288	317
Securities sold, not yet purchased, at fair value		133
Investment Segment | Industrial
Schedule of Investments
Equity securities	515	187
Securities sold, not yet purchased, at fair value	$ 59	107
Investment Segment | Debt securities
Schedule of Investments
Debt Securities		31
Securities sold, not yet purchased, at fair value		220
Investment Segment | Real Estate
Schedule of Investments
Debt Securities		31
Investment Segment | Communications
Schedule of Investments
Securities sold, not yet purchased, at fair value		$ 220