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Acquisitions and Divestitures (Details)
$ in Millions
1 Months Ended 3 Months Ended 4 Months Ended
Apr. 27, 2020
USD ($)
Mar. 31, 2020
USD ($)
License
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Business Acquisition [Line Items]            
Number of licenses acquired | License   4,940        
Payments for deposits       $ 210 $ 104  
Gain (loss) on disposition of licenses, pre-tax       (1,195) $ 0  
Spectrum licenses            
Business Acquisition [Line Items]            
Payments for deposits     $ 101     $ 325
Spectrum licenses | Subsequent Event            
Business Acquisition [Line Items]            
Payments for deposits $ 1,300          
Spectrum licenses            
Business Acquisition [Line Items]            
Price payable for acquisitions   $ 3,400        
Portion of price to be settled with 39 GHz licenses   1,800        
Series of Individually Immaterial Business Acquisitions | Spectrum licenses            
Business Acquisition [Line Items]            
Payments for deposits       146    
Disposal Group, Held-for-sale, Not Discontinued Operations | Spectrum licenses            
Business Acquisition [Line Items]            
Intangible assets held-for-sale   $ 1,600   $ 1,600   $ 1,600