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Acquisitions and Divestitures - Straight Path (Details) - Straight Path - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2018
May 31, 2017
Dec. 31, 2018
Business Acquisition [Line Items]      
Business acquisition consideration   $ 3,100  
Business acquisition, share price (in USD per share)   $ 184.00  
Payments to acquire assets   $ 736  
Number of shares issued related to assets purchase 49    
Equity issued related to assets purchase $ 2,400    
Purchase of asset, deferred tax liability recognized 1,400    
Wireless Licenses      
Business Acquisition [Line Items]      
Intangible assets acquired $ 4,500   $ 4,500