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Commitments and Contingencies Commitments and Contingencies Narrative (Details)
BRL in Millions, $ in Millions
6 Months Ended
Jun. 04, 2014
Jun. 30, 2015
USD ($)
Jun. 30, 2015
BRL
Jul. 31, 2013
Loss Contingencies [Line Items]        
Equity Method Investment, Ownership Percentage   40.00%    
Exchange Rate, Brazilian Real to USD   0.3166    
NYSE AMEX OPTION [Member]        
Loss Contingencies [Line Items]        
Number of External Investors, Significant Equity Interest Sold   7    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       16.00%
Redeemable Noncontrolling Interest, Equity, Fair Value   $ 128    
ATG ATS and NYSE BV Arbitration [Member] | NYSE BV Ownership Percentage in ATS [Member]        
Loss Contingencies [Line Items]        
Equity Method Investment, Ownership Percentage 20.00%      
ATG ATS and NYSE BV Arbitration [Member] | ATG Ownership Percentage in ATS [Member]        
Loss Contingencies [Line Items]        
Equity Method Investmetn, Ownership Percentage by External Investors 80.00%      
ATG ATS and NYSE BV Arbitration [Member] | Minimum [Member]        
Loss Contingencies [Line Items]        
Loss Contingency, Damages Sought, Value   $ 32 BRL 100