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Investments (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2016
Investments, Debt and Securities [Line Items]          
Unrealized gain (loss) on securities   $ 0 $ 0    
Trading securities   228 189    
Net income from unconsolidated investees   $ 2 $ 17 $ 0  
Borsa Istanbul Cost Method Investment          
Investments, Debt and Securities [Line Items]          
Ownership interest   5.00% 5.00%    
Cost method investment, original amount   $ 75      
LCH          
Investments, Debt and Securities [Line Items]          
Ownership interest   5.00% 5.00%    
OCC          
Investments, Debt and Securities [Line Items]          
Net income from unconsolidated investees $ 13        
Committed equity contribution     $ 150    
Capital contribution     $ 30    
Annual dividend from shareholders percentage     50.00%    
OCC | ISE          
Investments, Debt and Securities [Line Items]          
Ownership interest   40.00%     20.00%
TOM          
Investments, Debt and Securities [Line Items]          
Non-cash impairment charge   $ 7      
Foreign Government Debt Securities          
Investments, Debt and Securities [Line Items]          
Trading securities   $ 172 $ 166