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Investments - Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Investments [Line Items]
Investments	$ 11,480		$ 8,913
Securities sold, not yet purchased, at fair value	4,863		2,521
Investment Segment
Schedule of Investments [Line Items]
Investments	10,926		8,239
Securities sold, not yet purchased, at fair value	4,863		2,521
Unrealized gain (loss) on debt and equity securities still held	1,122	$ (4,170)
Investment Segment | Equity securities:
Schedule of Investments [Line Items]
Investments	10,795		8,118
Investment Segment | Consumer, non-cyclical
Schedule of Investments [Line Items]
Investments	2,079		1,548
Securities sold, not yet purchased, at fair value	971		424
Investment Segment | Consumer, cyclical
Schedule of Investments [Line Items]
Investments	2,572		2,073
Securities sold, not yet purchased, at fair value	405		572
Investment Segment | Energy
Schedule of Investments [Line Items]
Investments	3,703		2,654
Securities sold, not yet purchased, at fair value	3,091		1,476
Investment Segment | Utilities
Schedule of Investments [Line Items]
Investments	658		107
Securities sold, not yet purchased, at fair value	396		49
Investment Segment | Technology
Schedule of Investments [Line Items]
Investments	1,589		1,578
Investment Segment | Industrial
Schedule of Investments [Line Items]
Investments	194		158
Investment Segment | Corporate debt securities
Schedule of Investments [Line Items]
Investments	$ 131		$ 121

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 320
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 210
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