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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Investments [Line Items]
Investments	$ 8,706		$ 8,706		$ 10,038
Securities sold, not yet purchased, at fair value	368		368		1,023
Investment Segment
Schedule of Investments [Line Items]
Investments	8,132		8,132		9,532
Securities sold, not yet purchased, at fair value	368		368		1,023
Portion of trading gains (loss) that relates to trading securities still held at balance sheet date	345	$ 388	397	$ 622
Investment Segment | Equity securities:
Schedule of Investments [Line Items]
Investments	7,971		7,971		9,377
Securities sold, not yet purchased, at fair value	368		368		988
Investment Segment | Corporate debt securities
Schedule of Investments [Line Items]
Investments	161		161		155
Investment Segment | Basic materials | Equity securities:
Schedule of Investments [Line Items]
Investments	693		693		1,170
Investment Segment | Consumer, non-cyclical | Equity securities:
Schedule of Investments [Line Items]
Investments	2,277		2,277		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	1,471		1,471		777
Securities sold, not yet purchased, at fair value	104		104		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	1,606		1,606		1,489
Securities sold, not yet purchased, at fair value	113		113		110
Investment Segment | Financial | Equity securities:
Schedule of Investments [Line Items]
Investments	529		529		2,185
Investment Segment | Industrial | Equity securities:
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value	77		77		110
Investment Segment | Technology | Equity securities:
Schedule of Investments [Line Items]
Investments	1,169		1,169		833
Investment Segment | Other | Equity securities:
Schedule of Investments [Line Items]
Investments	$ 226		$ 226		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	27.90%		27.90%
Unrealized gain (loss) on equity method investments under fair value option	$ (106)	(142)	$ (158)	(236)
Fair value of equity method investment under fair value option	$ 359		$ 359		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	17.10%		17.10%
Unrealized gain (loss) on equity method investments under fair value option	$ 173	$ 241	$ 717	$ 423
Fair value of equity method investment under fair value option	$ 1,500		$ 1,500		$ 1,200

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