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Investments - Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Investments
Investments	$ 3,300		$ 3,300		$ 6,809
Securities sold, not yet purchased, at fair value	3,801		3,801		6,495
Investment Segment
Schedule of Investments
Investments	3,185		3,185		6,719
Securities sold, not yet purchased, at fair value	3,801		3,801		6,495
Portion of unrealized (losses) gains that relates to equity and debt securities still held	(255)	$ (250)	(286)	$ (1,172)
Investment Segment | Equity securities
Schedule of Investments
Investments	2,939		2,939		4,619
Securities sold, not yet purchased, at fair value	3,636		3,636		6,326
Investment Segment | Communication
Schedule of Investments
Equity securities					199
Investment Segment | Consumer, non-cyclical
Schedule of Investments
Equity securities	263		263		692
Securities sold, not yet purchased, at fair value	106		106		1,006
Investment Segment | Consumer, cyclical
Schedule of Investments
Securities sold, not yet purchased, at fair value					352
Investment Segment | Energy
Schedule of Investments
Equity securities	788		788		909
Securities sold, not yet purchased, at fair value	2,340		2,340		2,690
Investment Segment | Utilities
Schedule of Investments
Equity securities	1,149		1,149		1,205
Securities sold, not yet purchased, at fair value	541		541		813
Investment Segment | Healthcares
Schedule of Investments
Equity securities	447		447		320
Securities sold, not yet purchased, at fair value					387
Investment Segment | Technology
Schedule of Investments
Equity securities	133		133		655
Investment Segment | Materials
Schedule of Investments
Equity securities	136		136		153
Securities sold, not yet purchased, at fair value	529		529		598
Investment Segment | Industrial
Schedule of Investments
Equity securities	23		23		486
Securities sold, not yet purchased, at fair value	120		120		480
Investment Segment | Debt securities
Schedule of Investments
Investments	246		246		2,100
Investment Segment | Financial
Schedule of Investments
Debt Securities	156		156		1,958
Investment Segment | Real Estate
Schedule of Investments
Debt Securities	90		90		131
Investment Segment | Communications
Schedule of Investments
Debt Securities					11
Investment Segment | Materials
Schedule of Investments
Securities sold, not yet purchased, at fair value	$ 165		$ 165		$ 169

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

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