Investments Investment Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 31, 2021	Aug. 31, 2020	Jun. 30, 2020
Schedule of Investments [Line Items]
Investments	$ 8,913	$ 9,945
Securities sold, not yet purchased, at fair value	2,521	1,190
Fair value of equity method investment under fair value option	985	3,137
Unrealized gain on equity method investments under fair value option	(427)	265	$ 667
Total Assets	24,987	24,639
Total liabilities	15,730	13,697
Total revenues	6,123	8,994	11,777
Net sales/Other revenue from operations	6,815	9,722	10,576
Cost of goods sold/Other expenses from operations	6,320	8,205	8,993
Net (loss) income	(2,468)	(1,791)	2,001
Net (loss) income attributable to investee shareholders	(1,653)	(1,098)	1,482
Investment Segment
Schedule of Investments [Line Items]
Investments	8,239	9,207
Securities sold, not yet purchased, at fair value	2,521	1,190
Portion of unrealized (losses) gains that relates to equity and debt securities still held	65	706	(800)
Total Assets	14,119	11,283
Total liabilities	4,777	2,500
Total revenues	(1,249)	(1,414)	737
Net sales/Other revenue from operations	0
Cost of goods sold/Other expenses from operations	0
Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	8,118	9,062
Investment Segment | Debt securities
Schedule of Investments [Line Items]
Investments	121	145
Investment Segment | Basic materials
Schedule of Investments [Line Items]
Investments		281
Securities sold, not yet purchased, at fair value		209
Investment Segment | Consumer, non-cyclical
Schedule of Investments [Line Items]
Investments	1,548	2,085
Securities sold, not yet purchased, at fair value	424	29
Investment Segment | Consumer, cyclical
Schedule of Investments [Line Items]
Investments	2,073	2,427
Securities sold, not yet purchased, at fair value	572	379
Investment Segment | Energy
Schedule of Investments [Line Items]
Investments	2,654	1,717
Securities sold, not yet purchased, at fair value	1,476	124
Investment Segment | Utilities
Schedule of Investments [Line Items]
Investments	107
Securities sold, not yet purchased, at fair value	49
Investment Segment | Financial
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value		152
Investment Segment | Industrial
Schedule of Investments [Line Items]
Investments	158	127
Investment Segment | Technology
Schedule of Investments [Line Items]
Investments	1,578	2,425
Securities sold, not yet purchased, at fair value		217
Investment Segment | Communication
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value		80
Hertz
Schedule of Investments [Line Items]
Ownership percentage in equity method investment						38.90%
Fair value of equity method investment under fair value option		551
Unrealized gain on equity method investments under fair value option	(637)	105	(197)
Total Assets	24,627
Total liabilities	22,739
Non-controlling interests	119
Equity attributable to investee shareholders	1,769
Net sales/Other revenue from operations	2,755	9,779	9,504
Cost of goods sold/Other expenses from operations	3,231	8,051	8,045
Net (loss) income	(1,209)	(50)	(227)
Net (loss) income attributable to investee shareholders	$ (1,203)	(58)	(225)
Caesars
Schedule of Investments [Line Items]
Ownership percentage in equity method investment	16.70%
Fair value of equity method investment under fair value option		1,243
Unrealized gain on equity method investments under fair value option	$ 49	478
Herbalife
Schedule of Investments [Line Items]
Ownership percentage in equity method investment	15.50%			6.70%	23.80%
Fair value of equity method investment under fair value option	$ 985	1,343
Unrealized gain on equity method investments under fair value option	161	(318)	864
Total Assets		2,679
Total liabilities		3,069
Equity attributable to investee shareholders		(390)
Net sales/Other revenue from operations	2,609	4,877	4,892
Cost of goods sold/Other expenses from operations	518	958	919
Net (loss) income	161	311	297
Net (loss) income attributable to investee shareholders	$ 161	$ 311	$ 297