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Investments - Investment Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments
Investments	$ 2,310	$ 3,012
Securities sold, not yet purchased, at fair value	1,373	3,473
Investment Segment
Schedule of Investments
Investments	2,272	2,898
Securities sold, not yet purchased, at fair value	1,373	3,473
Portion of unrealized (losses) gains that relates to equity and debt securities still held	187	302	$ 1,544
Investment Segment | Equity securities
Schedule of Investments
Equity securities	2,241	2,611
Securities sold, not yet purchased, at fair value	1,153	3,288
Investment Segment | Communications
Schedule of Investments
Equity securities	129
Investment Segment | Consumer, cyclical
Schedule of Investments
Equity securities	277	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	57	708
Securities sold, not yet purchased, at fair value	460	2,146
Investment Segment | Utilities
Schedule of Investments
Equity securities	792	1,012
Securities sold, not yet purchased, at fair value	453	610
Investment Segment | Healthcare
Schedule of Investments
Equity securities	482	440
Investment Segment | Technology
Schedule of Investments
Equity securities		139
Investment Segment | Materials
Schedule of Investments
Equity securities	317	52
Securities sold, not yet purchased, at fair value	133	350
Investment Segment | Industrial
Schedule of Investments
Equity securities	187
Securities sold, not yet purchased, at fair value	107	138
Investment Segment | Debt securities
Schedule of Investments
Debt Securities	31	287
Securities sold, not yet purchased, at fair value	220	185
Investment Segment | Financials
Schedule of Investments
Debt Securities		158
Investment Segment | Real Estate
Schedule of Investments
Debt Securities	31	44
Investment Segment | Communications
Schedule of Investments
Debt Securities		85
Securities sold, not yet purchased, at fair value	$ 220
Investment Segment | Materials
Schedule of Investments
Securities sold, not yet purchased, at fair value		$ 185

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