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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