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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2016
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The following table summarizes the valuation of our investments, derivative contracts, securities sold not yet purchased and other liabilities by the above fair value hierarchy levels measured on a recurring and non-recurring basis as of September 30, 2016 and December 31, 2015:
| September 30, 2016 |  | December 31, 2015
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets | (in millions)
Investments (Note 4) | $ | 9,037 |  |  | $ | 405 |  |  | $ | 243 |  |  | $ | 9,685 |  |  | $ | 14,447 |  |  | $ | 289 |  |  | $ | 292 |  |  | $ | 15,028 |
Derivative contracts, at fair value(1) | — |  |  | 20 |  |  | — |  |  | 20 |  |  | — |  |  | 259 |  |  | — |  |  | 259 |
| $ | 9,037 |  |  | $ | 425 |  |  | $ | 243 |  |  | $ | 9,705 |  |  | $ | 14,447 |  |  | $ | 548 |  |  | $ | 292 |  |  | $ | 15,287 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased (Note 4) | $ | 1,154 |  |  | $ | 56 |  |  | $ | — |  |  | $ | 1,210 |  |  | $ | 794 |  |  | $ | — |  |  | $ | — |  |  | $ | 794 |
Other liabilities | — |  |  | 112 |  |  | — |  |  | 112 |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Derivative contracts, at fair value(2) | — |  |  | 768 |  |  | — |  |  | 768 |  |  | — |  |  | 36 |  |  | — |  |  | 36 |
| $ | 1,154 |  |  | $ | 936 |  |  | $ | — |  |  | $ | 2,090 |  |  | $ | 794 |  |  | $ | 39 |  |  | $ | — |  |  | $ | 833 |
(1) | Amounts are classified within other assets in our condensed consolidated balance sheets.
(2) | Amounts are classified within accrued expenses and other liabilities in our condensed consolidated balance sheets.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The changes in investments measured at fair value on a recurring basis for which we use Level 3 inputs to determine fair value are as follows:
| Nine Months Ended September 30,
| 2016 |  | 2015
| (in millions)
Balance at January 1 | $ | 283 |  |  | $ | 229 |
Net realized and unrealized gains (losses)(1) | 10 |  |  | (40 | )
Purchases | 50 |  |  | 100 |
Net transfers out | (121 | ) |  | (44 | )
Balance at September 30 | $ | 222 |  |  | $ | 245 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and 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 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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