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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Schedule of Investments [Line Items]
Investments	$ 9,302		$ 9,302		$ 9,881
Securities sold, not yet purchased, at fair value	1,729		1,729		1,139
Investment Segment
Schedule of Investments [Line Items]
Investments	8,620		8,620		9,213
Securities sold, not yet purchased, at fair value	1,729		1,729		1,139
Portion of trading gains (loss) that relates to trading securities still held at balance sheet date	388	$ (74)	622	$ (189)
Investment Segment | Equity securities:
Schedule of Investments [Line Items]
Investments	8,211		8,211		9,023
Securities sold, not yet purchased, at fair value	1,676		1,676		1,087
Investment Segment | Corporate debt securities
Schedule of Investments [Line Items]
Investments	409		409		190
Investment Segment | Basic materials | Equity securities:
Schedule of Investments [Line Items]
Investments	880		880		963
Investment Segment | Consumer, non-cyclical | Equity securities:
Schedule of Investments [Line Items]
Investments	2,203		2,203		2,677
Securities sold, not yet purchased, at fair value	161		161		0
Investment Segment | Consumer, cyclical | Equity securities:
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value	1,306		1,306		968
Investment Segment | Consumer, cyclical | Corporate debt securities
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value	53		53		52
Investment Segment | Energy | Equity securities:
Schedule of Investments [Line Items]
Investments	1,449		1,449		1,278
Securities sold, not yet purchased, at fair value	101		101		19
Investment Segment | Financial | Equity securities:
Schedule of Investments [Line Items]
Investments	2,151		2,151		2,385
Investment Segment | Industrial | Equity securities:
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value	108		108		100
Investment Segment | Technology | Equity securities:
Schedule of Investments [Line Items]
Investments	822		822		911
Investment Segment | Other | Equity securities:
Schedule of Investments [Line Items]
Investments	$ 706		$ 706		809
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	28.00%		28.00%
Unrealized gain (loss) on equity method investments under fair value option	$ (142)		$ (236)
Fair value of equity method investment under fair value option	$ 269		$ 269		505
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	19.60%		19.60%
Unrealized gain (loss) on equity method investments under fair value option	$ 241		$ 423
Fair value of equity method investment under fair value option	$ 1,300		$ 1,300		$ 867

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-Publisher FASB
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