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Discontinued Operations (Details)
3 Months Ended 9 Months Ended
May 01, 2017
USD ($)
agreement
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dispositions                
Cash and cash equivalents   $ 0   $ 3,000,000 $ 0 $ 3,000,000 $ 5,000,000 $ 2,000,000
Tempo Business                
Dispositions                
Number of commercial agreements | agreement 2              
Tempo Business | Discontinued Operations, Disposed of by Sale                
Dispositions                
Purchase price $ 4,300,000,000              
Gain on sale of discontinued operations, net of tax   5,000,000   0 803,000,000 0    
Depreciation and amortization   0            
Depreciation of fixed assets       18,000,000 8,000,000 53,000,000    
Amortization of intangible assets       $ 30,000,000 11,000,000 $ 90,000,000    
Cash and cash equivalents   $ 0     0   $ 5,000,000  
Maximum | Tempo Business | Discontinued Operations, Disposed of by Sale                
Dispositions                
Purchase price 4,200,000,000              
Deferred consideration $ 500,000,000              
Trade Names | Tempo Business | Discontinued Operations, Disposed of by Sale                
Dispositions                
Impairment of tradename     $ 380,000,000   $ 380,000,000