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Summary of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
agreement
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Cash and cash equivalents   $ 545,000,000 $ 377,000,000  
Restricted cash and cash equivalents, current   41,000,000 22,000,000  
Allowance for doubtful accounts   13,000,000 9,000,000 $ 13,000,000
Equity security impairment loss   0 0 0
Goodwill, impairment loss   0 0 0
Non-cash write-off related to indefinite-lived intangible asset   0 0 0
Asset impairment charges   0 9,000,000 8,000,000
Elimination of operating sublease income   $ (5,000,000) $ (3,000,000) $ (4,000,000)
Trade management services        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction   12 months    
United States | Listing services        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction   12 months    
Europe | Listing services        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction   12 months    
Corporate Services        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Number of types of license agreements | agreement   2    
Minimum | Listing services        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction   2 years    
Maximum | Listing services        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction   6 years    
Services transferred at a point in time | Market Services        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue recognized (percentage)   63.60% 62.70% 63.40%
Services transferred over time | Market Services        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue recognized (percentage)   36.40% 37.30% 36.60%
Rebranding of trade name        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Non-cash write-off related to indefinite-lived intangible asset       $ 578,000,000
Computer Software, Intangible Asset | Minimum        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Estimated useful life of intangible assets   3 years    
Computer Software, Intangible Asset | Maximum        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Estimated useful life of intangible assets   5 years    
Other        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Non-cash write-off related to indefinite-lived intangible asset       0
Employee Stock Purchase Plan        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Percentage of fair market value of common stock   85.00%    
Percentage of discount to employees on purchase of common stock under employee stock purchase plant   15.00%    
Cash Equivalents        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Cash and cash equivalents   $ 198,000,000 $ 183,000,000  
Order Machine        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Impairment charge       $ 7,000,000
Building and Building Improvements | Minimum        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Estimated useful life of property and equipment   10 years    
Building and Building Improvements | Maximum        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Estimated useful life of property and equipment   40 years    
Data processing equipment and software | Minimum        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Estimated useful life of property and equipment   2 years    
Data processing equipment and software | Maximum        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Estimated useful life of property and equipment   5 years    
Furniture And Equipment | Minimum        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Estimated useful life of property and equipment   5 years    
Furniture And Equipment | Maximum        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Estimated useful life of property and equipment   10 years    
Subsequent Event        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Net lease assets $ 442,000,000      
Lease liabilities 483,000,000      
Accounting Standards Update 2016-02 | Subsequent Event        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Elimination of operating sublease income $ 41,000,000