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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