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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Investments	$ 9,881	$ 15,351
Securities sold, not yet purchased, at fair value	1,139	794
Investment Segment
Schedule of Investments [Line Items]
Investments	9,213	14,553
Securities sold, not yet purchased, at fair value	1,139	794
Portion of trading (losses) gains that relates to trading securities still held at balance sheet date	340	(2,200)
Unrealized Gain on Securities	(502)
Fair Value of Equity Method Investment Under Fair Value Option	1,400
Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	9,023	14,324
Securities sold, not yet purchased, at fair value	1,087	794
Investment Segment | Debt securities
Schedule of Investments [Line Items]
Investments	190	72
Basic materials | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	963	563
Communications | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	169	407
Consumer, non-cyclical | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	2,677	3,684
Consumer, cyclical | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	408	115
Securities sold, not yet purchased, at fair value	968	794
Consumer, cyclical | Investment Segment | Debt securities
Schedule of Investments [Line Items]
Investments	186	55
Securities sold, not yet purchased, at fair value	52	0
Diversified | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	7	17
Energy | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	1,278	1,461
Securities sold, not yet purchased, at fair value	19	0
Financial | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	2,385	2,094
Financial | Investment Segment | Debt securities
Schedule of Investments [Line Items]
Investments	4	4
Financial | Investment Segment | Mortgage backed securities
Schedule of Investments [Line Items]
Investments	0	157
Industrial | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	214	188
Securities sold, not yet purchased, at fair value	100	0
Technology | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	911	5,795
Sovereign debt | Investment Segment | Debt securities
Schedule of Investments [Line Items]
Investments	0	13
Utilities | Investment Segment | Equity securities
Schedule of Investments [Line Items]
Investments	$ 11	$ 0
Herbalife | Investment Segment
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage	24.20%
Hertz | Investment Segment
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage	35.30%

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