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Goodwill and Acquired Intangible Assets (Narrative) (Details) - USD ($)
 12 Months Ended
Jan. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill expected to be deductible in future periods   $ 879,000,000    
Goodwill, impairment loss   0 $ 0 $ 0
Amortization expense for purchased finite-lived intangible assets   82,000,000 62,000,000 69,000,000
Future amortization expense, impact of foreign currency translation adjustments   102,000,000    
Rebranding of Trade Name        
Schedule of Goodwill and Intangible Assets [Line Items]        
Non-cash intangible asset impairment charges   578,000,000 $ 119,000,000  
Customer relationships        
Schedule of Goodwill and Intangible Assets [Line Items]        
Non-cash intangible asset impairment charges       38,000,000
eSpeed        
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill expected to be deductible in future periods   561,000,000    
eSpeed | Customer relationships | Income Approach Valuation Technique        
Schedule of Goodwill and Intangible Assets [Line Items]        
Finite lived intangible, fair value       $ 71,000,000
TR Corporate Solutions Businesses        
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill expected to be deductible in future periods   237,000,000    
Other Acquisitions        
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill expected to be deductible in future periods   $ 81,000,000    
Trade name | Subsequent Event | eSpeed        
Schedule of Goodwill and Intangible Assets [Line Items]        
Asset impairment charges $ 578,000,000