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Clearing Operations (Tables) | 9 Months Ended
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Sep. 30, 2018
Due to and from Broker-Dealers and Clearing Organizations [Abstract] |
Schedule of Clearing Member Default Fund Contributions | As of September 30, 2018, clearing member default fund contributions and margin deposits were as follows:
| September 30, 2018
| Cash Contributions |  | Non-Cash Contributions |  | Total Contributions
| (in millions)
Default fund contributions | $ | 407 |  |  | $ | 108 |  |  | $ | 515 |
Margin deposits | 3,812 |  |  | 3,922 |  |  | 7,734 |
Total | $ | 4,219 |  |  | $ | 4,030 |  |  | $ | 8,249 |
Schedule of Derivative Contracts Outstanding | The following table includes the market value of derivative contracts outstanding prior to netting:
| September 30, 2018
| (in millions)
Commodity and seafood options, futures and forwards(1)(2)(3) | $ | 1,106 |
Fixed-income options and futures(1)(2) | 520 |
Stock options and futures(1)(2) | 187 |
Index options and futures(1)(2) | 91 |
Total | $ | 1,904 |
____________
(1) | We determined the fair value of our option contracts using standard valuation models that were based on market-based observable inputs including implied volatility, interest rates and the spot price of the underlying instrument.
(2) | We determined the fair value of our futures contracts based upon quoted market prices and average quoted market yields.
(3) | We determined the fair value of our forward contracts using standard valuation models that were based on market-based observable inputs including LIBOR rates and the spot price of the underlying instrument.
Schedule of Derivative Contracts Cleared | The following table includes the total number of derivative contracts cleared through Nasdaq Clearing for the nine months ended September 30, 2018 and 2017:
| September 30, 2018 |  | September 30, 2017
Commodity and seafood options, futures and forwards(1) | 1,506,560 |  |  | 2,040,033 |
Fixed-income options and futures | 16,833,278 |  |  | 14,788,850 |
Stock options and futures | 17,735,228 |  |  | 20,070,584 |
Index options and futures | 35,569,046 |  |  | 32,748,357 |
Total | 71,644,112 |  |  | 69,647,824 |
____________
(1) | The total volume in cleared power related to commodity contracts was 853 Terawatt hours (TWh) for the nine months ended September 30, 2018 and 911 TWh for the nine months ended September 30, 2017.

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41641-113959 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579240-113959 + Details
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