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Intangible Assets and Goodwill - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Feb. 19, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]        
Goodwill   $ 938 $ 728 $ 420
Net present value of deferred consideration payment to former owners   $ (83) $ 0  
Airwave        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]        
Cash $ 86      
Accounts receivable, net 55      
Other current assets 36      
Property, plant and equipment, net 245      
Deferred income taxes 82      
Accounts payable (18)      
Accrued liabilities (181)      
Other liabilities (289)      
Goodwill 191      
Intangible assets 875      
Total consideration 1,082      
Net present value of deferred consideration payment to former owners (82)      
Net cash consideration at purchase $ 1,000