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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |  |
Investments | $ 10,026 |  | $ 15,351
Securities sold, not yet purchased, at fair value | 1,052 |  | 794
Investment Segment [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 9,271 |  | 14,553
Securities sold, not yet purchased, at fair value | 1,052 |  | 794
Portion of trading gains (loss) that relates to trading securities still held | (174) | $ 458 |
Investment Segment [Member] | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 9,001 |  | 14,324
Securities sold, not yet purchased, at fair value | 998 |  | 794
Investment Segment [Member] | Corporate debt: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 132 |  | 72
Investment Segment [Member] | Basic materials | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 860 |  | 563
Investment Segment [Member] | Communications | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 218 |  | 407
Investment Segment [Member] | Consumer, non-cyclical | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 3,035 |  | 3,684
Securities sold, not yet purchased, at fair value | 0 |  | 794
Investment Segment [Member] | Consumer, cyclical | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 163 |  | 115
Securities sold, not yet purchased, at fair value | 847 |  | 0
Investment Segment [Member] | Consumer, cyclical | Corporate debt: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 116 |  | 55
Investment Segment [Member] | Diversified | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 16 |  | 17
Investment Segment [Member] | Energy | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,292 |  | 1,461
Investment Segment [Member] | Energy | Corporate debt: |  |  |
Schedule of Investments [Line Items] |  |  |
Securities sold, not yet purchased, at fair value | 54 |  | 0
Investment Segment [Member] | Financial | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,921 |  | 2,094
Securities sold, not yet purchased, at fair value | 151 |  | 0
Investment Segment [Member] | Financial | Corporate debt: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 4 |  | 4
Investment Segment [Member] | Financial | Mortgage-backed securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 138 |  | 157
Investment Segment [Member] | Industrial | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 222 |  | 188
Investment Segment [Member] | Technology | Equity securities: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 1,274 |  | 5,795
Investment Segment [Member] | Sovereign debt | Corporate debt: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 0 |  | 13
Investment Segment [Member] | Utilities | Corporate debt: |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 12 |  | $ 0

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- Definition Fair value of obligations incurred from short sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35711043&loc=d3e42429-110968 + Details
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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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