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Investments - Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Investments
Investments	$ 2,585		$ 2,585		$ 3,012
Securities sold, not yet purchased, at fair value	2,679		2,679		3,473
Investment Segment
Schedule of Investments
Investments	2,476		2,476		2,898
Securities sold, not yet purchased, at fair value	2,679		2,679		3,473
Portion of unrealized (losses) gains that relates to equity and debt securities still held	101	$ (255)	(229)	$ (286)
Investment Segment | Equity securities
Schedule of Investments
Equity securities	2,444		2,444		2,611
Securities sold, not yet purchased, at fair value	1,998		1,998		3,288
Investment Segment | Communications
Schedule of Investments
Equity securities	67		67
Investment Segment | Consumer, cyclical
Schedule of Investments
Equity securities	292		292		260
Securities sold, not yet purchased, at fair value					3
Investment Segment | Consumer, non-cyclical
Schedule of Investments
Securities sold, not yet purchased, at fair value					41
Investment Segment | Energy
Schedule of Investments
Equity securities	59		59		708
Securities sold, not yet purchased, at fair value	988		988		2,146
Investment Segment | Utilities
Schedule of Investments
Equity securities	937		937		1,012
Securities sold, not yet purchased, at fair value	578		578		610
Investment Segment | Healthcare
Schedule of Investments
Equity securities	521		521		440
Investment Segment | Technology
Schedule of Investments
Equity securities					139
Investment Segment | Materials
Schedule of Investments
Equity securities	394		394		52
Securities sold, not yet purchased, at fair value	298		298		350
Investment Segment | Industrial
Schedule of Investments
Equity securities	174		174
Securities sold, not yet purchased, at fair value	134		134		138
Investment Segment | Debt securities
Schedule of Investments
Debt Securities	32		32		287
Investment Segment | Financials
Schedule of Investments
Debt Securities					158
Investment Segment | Real Estate
Schedule of Investments
Debt Securities	32		32		44
Investment Segment | Communications
Schedule of Investments
Debt Securities	661		661		85
Investment Segment | Materials
Schedule of Investments
Securities sold, not yet purchased, at fair value	$ 20		$ 20		$ 185

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Amount of unrealized gain (loss) on investment in debt and equity securities.

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