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Commitments and Contingencies (Details)
AUD in Millions, $ in Millions
1 Months Ended 3 Months Ended
Feb. 19, 2016
AUD
Apr. 30, 2013
AUD
investment
Mar. 31, 2016
USD ($)
Jan. 28, 2016
employee
Aug. 31, 2015
employee
shareholder
Jun. 30, 2012
Shareholder Derivative Action            
Loss Contingencies [Line Items]            
Number of shareholders commencing punitive derivative action | shareholder         2  
City of Swan            
Loss Contingencies [Line Items]            
Number of synthetic collateralized debt obligations | investment   8        
Damages sought   AUD 327        
Settlement amount payable AUD 144          
CME Group | S&P DJ Indices            
Loss Contingencies [Line Items]            
Revenues earned under license agreement | $     $ 22      
Noncontrolling interest ownership by noncontrolling owners           27.00%
S&P Ratings | Shareholder Derivative Action            
Loss Contingencies [Line Items]            
Number of former employees named as defendants | employee       9 3