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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Schedule of Investments [Line Items]
Investments	$ 9,748		$ 9,748		$ 9,881
Securities sold, not yet purchased, at fair value	1,258		1,258		1,139
Investment Segment
Schedule of Investments [Line Items]
Investments	9,016		9,016		9,213
Securities sold, not yet purchased, at fair value	1,258		1,258		1,139
Portion of trading gains (loss) that relates to trading securities still held at balance sheet date	635	$ 754	1,200	$ 626
Investment Segment | Equity securities:
Schedule of Investments [Line Items]
Investments	8,543		8,543		9,023
Securities sold, not yet purchased, at fair value	1,213		1,213		1,087
Investment Segment | Corporate debt securities
Schedule of Investments [Line Items]
Investments	473		473		190
Investment Segment | Basic materials | Equity securities:
Schedule of Investments [Line Items]
Investments	867		867		963
Investment Segment | Consumer, non-cyclical | Equity securities:
Schedule of Investments [Line Items]
Investments	2,459		2,459		2,677
Securities sold, not yet purchased, at fair value	219		219		0
Investment Segment | Consumer, cyclical | Equity securities:
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value	798		798		968
Investment Segment | Consumer, cyclical | Corporate debt securities
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value	45		45		52
Investment Segment | Energy | Equity securities:
Schedule of Investments [Line Items]
Investments	1,178		1,178		1,278
Securities sold, not yet purchased, at fair value	94		94		19
Investment Segment | Financial | Equity securities:
Schedule of Investments [Line Items]
Investments	2,111		2,111		2,385
Investment Segment | Industrial | Equity securities:
Schedule of Investments [Line Items]
Securities sold, not yet purchased, at fair value	102		102		100
Investment Segment | Technology | Equity securities:
Schedule of Investments [Line Items]
Investments	908		908		911
Investment Segment | Other | Equity securities:
Schedule of Investments [Line Items]
Investments	$ 1,020		$ 1,020		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	$ 254		$ 19
Fair value of equity method investment under fair value option	$ 524		$ 524		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	21.00%		21.00%
Unrealized gain (loss) on equity method investments under fair value option	$ (64)	$ 52	$ 359	$ 119
Fair value of equity method investment under fair value option	$ 1,200		$ 1,200		$ 867

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-Publisher FASB
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