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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table presents our financial assets that are measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016. We did not have any financial liabilities measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016.
| March 31, 2017
| Total |  | Level 1 |  | Level 2 |  | Level 3
| (in millions)
Financial investments, at fair value | $ | 220 |  |  | $ | 203 |  |  | $ | 17 |  |  | $ | — |
Default fund and margin deposit investments | 2,186 |  |  | 1,610 |  |  | 576 |  |  | — |
Total | $ | 2,406 |  |  | $ | 1,813 |  |  | $ | 593 |  |  | $ | — |
| December 31, 2016
| Total |  | Level 1 |  | Level 2 |  | Level 3
| (in millions)
Financial investments, at fair value | $ | 245 |  |  | $ | 228 |  |  | $ | 17 |  |  | $ | — |
Default fund and margin deposit investments | 1,900 |  |  | 1,763 |  |  | 137 |  |  | — |
Total | $ | 2,145 |  |  | $ | 1,991 |  |  | $ | 154 |  |  | $ | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 2 -Subparagraph (b) -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 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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