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Commitments and Contingencies - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2017
lawsuit
institution
Jun. 30, 2015
USD ($)
May 31, 2014
lawsuit
Dec. 31, 2017
USD ($)
Entity
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2017
Jul. 01, 2015
Other Commitments [Line Items]                
Operating leases, rent expense       $ 65 $ 65 $ 53    
Redemption fair value         $ 36      
Number of financial institutions | institution 40              
Number of class action lawsuits | lawsuit 4   3          
Expense accruals relating to ongoing SEC investigations and inquiries       $ 14        
Gasunie                
Other Commitments [Line Items]                
Percentage of voting interests acquired         21.00%   21.00%  
ABN AMRO Clearing Bank N.V                
Other Commitments [Line Items]                
Percentage of voting interests acquired         25.00%   25.00%  
ICE Endex and ICE Clear Netherlands                
Other Commitments [Line Items]                
Percentage of voting interests acquired       100.00%     100.00%  
NYSE Amex options                
Other Commitments [Line Items]                
Percentage of voting interests acquired   16.00%           100.00%
Number of US options exchanges | Entity       2        
Number of external investors | Entity       7        
Payments to acquire businesses and interest in affiliates   $ 128