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Clearing Operations (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) fund contract | Sep. 30, 2017 USD ($) contract | Dec. 31, 2017 USD ($)
Clearing Operations [Line Items] |  |  |  |  |  |
Number of member sponsored default funds | fund |  |  |  | 4 |  |
Loss due to commodities market default | $ 133 |  |  |  |  |
Loss due to commodities market default allocated to junior capital | 8 |  |  |  |  |
Temporary capital | 22 | $ 22 |  | $ 22 |  |
Liability due to market default | 56 | 56 |  | 56 |  |
Collateral due to market default | 56 | 56 |  | 56 |  |
Default funds and margin deposits | 4,219 | 4,219 |  | 4,219 |  | $ 3,988
Default fund contributions | 515 | 515 |  | 515 |  |
Committed capital | 202 | 202 |  | 202 |  | $ 235
Liability Waterfall |  |  |  |  |  |
Clearing Operations [Line Items] |  |  |  |  |  |
Loss due to commodities market default allocated to junior capital | 8 | 8 | $ 0 | 8 | $ 0 |
Junior capital, cash deposits and pledged assets | 31 | 31 |  | 31 |  |
Senior capital, cash deposits and pledged assets | 22 | 22 |  | 22 |  |
Committed capital | 67 | 67 |  | 67 |  |
Utilize as capital resources |  |  |  |  |  |
Clearing Operations [Line Items] |  |  |  |  |  |
Default fund contributions | 463 | 463 |  | 463 |  |
Utilize as member posted surplus balance |  |  |  |  |  |
Clearing Operations [Line Items] |  |  |  |  |  |
Default fund contributions | 52 | 52 |  | 52 |  |
Nasdaq Clearing |  |  |  |  |  |
Clearing Operations [Line Items] |  |  |  |  |  |
Temporary capital | 22 | 22 |  | $ 22 |  |
Temporary capital, holding time period |  |  |  | 90 days |  |
Default fund cash contributions invested in highly rated government debt securities |  |  |  | $ 1,187 |  |
Maturity period of time deposits |  |  |  | 90 days |  |
Committed capital | 128 | 128 |  | $ 128 |  |
Power of assessment of the clearing member's contribution to the financial markets and commodities markets default funds |  |  |  | 100.00% |  |
Contract value of resale and repurchase agreements | 4,100 | 4,100 | $ 5,000 | $ 4,100 | $ 5,000 |
Total number of derivative contracts cleared | contract |  |  |  | 6,835,634 | 5,891,900 |
Nasdaq Clearing | Reverse Repurchase Agreements |  |  |  |  |  |
Clearing Operations [Line Items] |  |  |  |  |  |
Default funds and margin deposits | $ 430 | $ 430 |  | $ 430 |  |
Minimum |  |  |  |  |  |
Clearing Operations [Line Items] |  |  |  |  |  |
Reverse purchase agreements, maturity range |  |  |  | 1 day |  |
Maximum |  |  |  |  |  |
Clearing Operations [Line Items] |  |  |  |  |  |
Reverse purchase agreements, maturity range |  |  |  | 19 days |  |

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