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Discontinued Operations (Details)
12 Months Ended
May 01, 2017
USD ($)
agreement
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dispositions        
Cash and cash equivalents from discontinued operations       $ 5,000,000
Tempo Business        
Dispositions        
Number of commercial agreements | agreement 2      
Tempo Business | Discontinued Operations, Disposed of by Sale        
Dispositions        
Purchase price $ 4,300,000,000      
Depreciation of fixed assets   $ 8,000,000    
Amortization of intangible assets   $ 11,000,000    
Cash and cash equivalents from discontinued operations     $ 0  
Maximum | Tempo Business | Discontinued Operations, Disposed of by Sale        
Dispositions        
Purchase price 4,200,000,000      
Deferred consideration $ 500,000,000