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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule of Investments [Line Items]
Investments	$ 9,332		$ 9,332		$ 10,038
Securities sold, not yet purchased, at fair value	625		625		1,023
Investment Segment
Schedule of Investments [Line Items]
Investments	8,711		8,711		9,532
Securities sold, not yet purchased, at fair value	625		625		1,023
Portion of unrealized gains (loss) that relates to securities still held at balance sheet date	(4)	$ 635	356	$ 1,242
Investment Segment | Equity securities:
Schedule of Investments [Line Items]
Investments	8,501		8,501		9,377
Securities sold, not yet purchased, at fair value	625		625		988
Investment Segment | Corporate debt securities
Schedule of Investments [Line Items]
Investments	210		210		155
Investment Segment | Basic materials | Equity securities:
Schedule of Investments [Line Items]
Investments	559		559		1,170
Investment Segment | Consumer, non-cyclical | Equity securities:
Schedule of Investments [Line Items]
Investments	2,402		2,402		2,551
Securities sold, not yet purchased, at fair value	74		74		101
Investment Segment | Consumer, cyclical | Equity securities:
Schedule of Investments [Line Items]
Investments	1,378		1,378		777
Securities sold, not yet purchased, at fair value	122		122		667
Investment Segment | Consumer, cyclical | Corporate debt securities
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value	0		0		35
Investment Segment | Energy | Equity securities:
Schedule of Investments [Line Items]
Investments	1,870		1,870		1,489
Securities sold, not yet purchased, at fair value	362		362		110
Investment Segment | Financial | Equity securities:
Schedule of Investments [Line Items]
Investments	477		477		2,185
Investment Segment | Industrial | Equity securities:
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value	67		67		110
Investment Segment | Technology | Equity securities:
Schedule of Investments [Line Items]
Investments	1,603		1,603		833
Investment Segment | Other | Equity securities:
Schedule of Investments [Line Items]
Investments	$ 212		$ 212		372
Hertz | Investment Segment
Schedule of Investments [Line Items]
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method	27.80%		27.80%
Unrealized gain (loss) on equity method investments under fair value option	$ 23	254	$ (135)	19
Fair value of equity method investment under fair value option	$ 382		$ 382		517
Herbalife | Investment Segment
Schedule of Investments [Line Items]
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method	17.90%		17.90%
Unrealized gain (loss) on equity method investments under fair value option	$ 23	$ (64)	$ 740	$ 359
Fair value of equity method investment under fair value option	$ 1,500		$ 1,500		$ 1,200

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