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Clearing Operations (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) fund contract | Dec. 31, 2015 USD ($) contract
Clearing Operations [Line Items] |  |
Number of member sponsored default funds | fund | 4 |
Default funds and margin deposits | $ 3,301 | $ 2,228
Default fund cash contributions invested in highly rated government debt securities | 1,763 | 1,253
Default fund contributions | 403 |
Committed capital | 245 | 201
Liability Waterfall |  |
Clearing Operations [Line Items] |  |
Junior capital, cash deposits and pledged assets | 18 |
Senior capital, cash deposits and pledged assets | 49 |
Reverse Repurchase Agreements |  |
Clearing Operations [Line Items] |  |
Default funds and margin deposits | 137 | 303
Cash Contributions |  |
Clearing Operations [Line Items] |  |
Default fund contributions | 314 |
Utilize as capital resources |  |
Clearing Operations [Line Items] |  |
Default fund contributions | 332 |
Utilize as member posted surplus balance |  |
Clearing Operations [Line Items] |  |
Default fund contributions | 71 |
Nasdaq Clearing |  |
Clearing Operations [Line Items] |  |
Default fund cash contributions invested in highly rated government debt securities | 1,763 |
Committed capital | 133 |
Outstanding contract value of resale and repurchase agreements | $ 1,900 | $ 1,100
Total number of derivative contracts cleared | contract | 7,941,666 | 7,908,873
Power of assessment of the clearing member's contribution to the financial markets and commodities markets default funds | 100.00% |
Nasdaq Clearing | Reverse Repurchase Agreements |  |
Clearing Operations [Line Items] |  |
Default funds and margin deposits | $ 137 |

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