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Acquisitions - Additional Information (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 01, 2017
USD ($)
Feb. 01, 2017
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2018
EUR (€)
Feb. 28, 2017
USD ($)
Business Acquisition [Line Items]                  
Strategic transaction expenses       $ (1)   $ 11      
Purchase price, cash consideration         $ 182      
Customer Relationships [Member]                  
Business Acquisition [Line Items]                  
Finite-Lived Intangible Assets, Gross     $ 470 474     $ 470    
Core Technology [Member]                  
Business Acquisition [Line Items]                  
Finite-Lived Intangible Assets, Gross     95 96     95    
Trademarks and Trade Names [Member]                  
Business Acquisition [Line Items]                  
Finite-Lived Intangible Assets, Gross     17 $ 18     17    
USM - Warren [Member]                  
Business Acquisition [Line Items]                  
Closing payment, including settlement of trade payables $ 104                
Trade payables                 $ 25
Purchase price adjustments         $ 1        
Strategic transaction expenses             5    
USM - Warren [Member] | Minimum [Member]                  
Business Acquisition [Line Items]                  
Fixed asset, useful life 1 year                
USM - Warren [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Fixed asset, useful life 17 years                
USM - Warren [Member] | Customer Relationships [Member]                  
Business Acquisition [Line Items]                  
Finite-Lived Intangible Assets, Gross $ 30                
Acquired finite-lived intangible assets, weighted average useful life 11 years                
USM - Warren [Member] | Core Technology [Member]                  
Business Acquisition [Line Items]                  
Finite-Lived Intangible Assets, Gross $ 3                
Acquired finite-lived intangible assets, weighted average useful life 18 years                
BFP and BPT [Member]                  
Business Acquisition [Line Items]                  
Purchase price adjustments     $ 9            
Strategic transaction expenses             $ 7    
Percent of ownership interest acquired   80.00%              
Purchase price, cash consideration   $ 181              
Agreement to purchase certain real estate | €               € 25  
BFP and BPT [Member] | Minimum [Member]                  
Business Acquisition [Line Items]                  
Fixed asset, useful life   3 years              
BFP and BPT [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Fixed asset, useful life   30 years              
BFP and BPT [Member] | Customer Relationships [Member]                  
Business Acquisition [Line Items]                  
Finite-Lived Intangible Assets, Gross   $ 29              
Acquired finite-lived intangible assets, weighted average useful life   17 years              
BFP and BPT [Member] | Trademarks and Trade Names [Member]                  
Business Acquisition [Line Items]                  
Finite-Lived Intangible Assets, Gross   $ 12              
Acquired finite-lived intangible assets, weighted average useful life   17 years