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Investments - Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Schedule of Investments
Investments	$ 2,306		$ 2,306		$ 3,012
Securities sold, not yet purchased, at fair value	2,128		2,128		3,473
Investment Segment
Schedule of Investments
Investments	2,196		2,196		2,898
Securities sold, not yet purchased, at fair value	2,128		2,128		3,473
Portion of unrealized (losses) gains that relates to equity and debt securities still held	(86)	$ (69)	(360)	$ (124)
Investment Segment | Equity securities
Schedule of Investments
Equity securities	2,167		2,167		2,611
Securities sold, not yet purchased, at fair value	2,065		2,065		3,288
Investment Segment | Communications
Schedule of Investments
Equity securities	20		20
Investment Segment | Consumer, non-cyclical
Schedule of Investments
Securities sold, not yet purchased, at fair value					41
Investment Segment | Consumer, cyclical
Schedule of Investments
Equity securities	304		304		260
Securities sold, not yet purchased, at fair value					3
Investment Segment | Energy
Schedule of Investments
Equity securities	62		62		708
Securities sold, not yet purchased, at fair value	1,216		1,216		2,146
Investment Segment | Utilities
Schedule of Investments
Equity securities	882		882		1,012
Securities sold, not yet purchased, at fair value	438		438		610
Investment Segment | Healthcare
Schedule of Investments
Equity securities	384		384		440
Investment Segment | Technology
Schedule of Investments
Equity securities					139
Investment Segment | Materials
Schedule of Investments
Equity securities	357		357		52
Securities sold, not yet purchased, at fair value	248		248		350
Investment Segment | Industrial
Schedule of Investments
Equity securities	158		158
Securities sold, not yet purchased, at fair value	163		163		138
Investment Segment | Debt securities
Schedule of Investments
Debt Securities	29		29		287
Investment Segment | Financials
Schedule of Investments
Debt Securities					158
Investment Segment | Real Estate
Schedule of Investments
Debt Securities	29		29		44
Investment Segment | Communications
Schedule of Investments
Debt Securities					85
Investment Segment | Materials
Schedule of Investments
Securities sold, not yet purchased, at fair value	$ 63		$ 63		$ 185

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

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