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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2017
Fair Value Disclosures [Abstract] |
Assets measured at fair value on a recurring basis |
| March 31, 2017 |  | December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets | (in millions)
Investments (Note 4) | $ | 9,163 |  |  | $ | 389 |  |  | $ | 214 |  |  | $ | 9,766 |  |  | $ | 9,033 |  |  | $ | 306 |  |  | $ | 212 |  |  | $ | 9,551 |
Derivative contracts, at fair value(1) | — |  |  | 8 |  |  | — |  |  | 8 |  |  | — |  |  | 23 |  |  | — |  |  | 23 |
| $ | 9,163 |  |  | $ | 397 |  |  | $ | 214 |  |  | $ | 9,774 |  |  | $ | 9,033 |  |  | $ | 329 |  |  | $ | 212 |  |  | $ | 9,574 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased (Note 4) | $ | 2,139 |  |  | $ | 53 |  |  | $ | — |  |  | $ | 2,192 |  |  | $ | 1,087 |  |  | $ | 52 |  |  | $ | — |  |  | $ | 1,139 |
Other liabilities | — |  |  | 180 |  |  | — |  |  | 180 |  |  | — |  |  | 187 |  |  | — |  |  | 187 |
Derivative contracts, at fair value(2) | — |  |  | 1,673 |  |  | — |  |  | 1,673 |  |  | — |  |  | 1,139 |  |  | — |  |  | 1,139 |
| $ | 2,139 |  |  | $ | 1,906 |  |  | $ | — |  |  | $ | 4,045 |  |  | $ | 1,087 |  |  | $ | 1,378 |  |  | $ | — |  |  | $ | 2,465 |
(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.
Assets measured at fair value on a recurring basis for which we use Level 3 inputs to determine fair value |
| Three Months Ended March 31,
| 2017 |  | 2016
| (in millions)
Balance at January 1 | $ | 212 |  |  | $ | 283 |
Net realized and unrealized gains (losses)(1) | 1 |  |  | 16 |
Purchases | — |  |  | 50 |
Transfers out | — |  |  | (128 | )
Transfers in | 1 |  |  | 6 |
Balance at March 31 | $ | 214 |  |  | $ | 227 |
(1) Includes net unrealized losses of $1 million and $0 million for the three months ended March 31, 2017 and 2016, respectively, relating to investments still held at March 31 of each respective period and which are included in net gain (loss) from investment activities in the condensed consolidated statements of operations.

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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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