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Clearing Operations (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) contract fund | Mar. 31, 2016 USD ($) contract | Dec. 31, 2016 USD ($)
Clearing Operations [Line Items] |  |  |
Number of member sponsored default funds | fund | 4 |  |
Default funds and margin deposits | $ 3,633 |  | $ 3,301
Default fund cash contributions invested in highly rated government debt securities | 1,610 |  | 1,763
Default fund contributions | 433 |  |
Committed capital | 220 |  | 245
Liability Waterfall |  |  |
Clearing Operations [Line Items] |  |  |
Junior capital, cash deposits and pledged assets | 18 |  |
Senior capital, cash deposits and pledged assets | 28 |  |
Reverse Repurchase Agreements |  |  |
Clearing Operations [Line Items] |  |  |
Default funds and margin deposits | 576 |  | $ 137
Utilize as capital resources |  |  |
Clearing Operations [Line Items] |  |  |
Default fund contributions | 370 |  |
Utilize as member posted surplus balance |  |  |
Clearing Operations [Line Items] |  |  |
Default fund contributions | 63 |  |
Nasdaq Clearing |  |  |
Clearing Operations [Line Items] |  |  |
Default fund cash contributions invested in highly rated government debt securities | 1,610 |  |
Committed capital | 115 |  |
Outstanding contract value of resale and repurchase agreements | $ 6,300 | $ 6,400 |
Total number of derivative contracts cleared | contract | 1,979,972 | 1,820,753 |
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 | $ 576 |  |

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