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Fair Value Measurements Changes in Fair Value Level 3 (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |  |  |  |
Unrealized gain included in earnings related to Level 3 assets still held at period end |  | $ 6 | $ 40 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |  |  |  |
Fair value of investments measured at fair value on a recurring basis |  | 222 | 245 |  |
Other Segments and Holding Company [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |  |  |  |
Fair value of investments measured at fair value on a recurring basis |  |  |  | $ 283 | $ 229
Net realized and unrealized gains (losses)(1) | [1] | 10 | (40) |  |
Purchases |  | 50 |  |  |
Net transfers out |  | $ (121) | (44) |  |
Trading Securities [Member] | Other Segments and Holding Company [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |  |  |  |
Purchases |  |  | $ 100 |  |
[1] | Includes net unrealized losses of $6 million and $40 million for the nine months ended September 30, 2016 and 2015, respectively, relating to investments still held at September 30 of each respective period and which are included in net (loss) gain from investment activities in the condensed consolidated statements of operations.

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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