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Acquisitions and Divestitures (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended
May 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
License
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Business Acquisition [Line Items]                
Number of licenses acquired | License   4,940            
Payments for deposits           $ 1,801 $ 199  
Gain (loss) on disposition of licenses, pre-tax       $ 0 $ 0 (1,195) $ 0  
Goodwill     $ 24,389 $ 24,667   24,667   $ 24,667
Spectrum licenses                
Business Acquisition [Line Items]                
Payments for deposits     $ 101         $ 1,600
Spectrum licenses                
Business Acquisition [Line Items]                
Price payable for acquisitions   $ 3,400            
Portion of price to be settled with 39 GHz licenses   $ 1,800            
Average remaining renewal period of wireless license portfolio (in years)   9 years 10 months 24 days            
Series of Individually Immaterial Business Acquisitions | Spectrum licenses                
Business Acquisition [Line Items]                
Payments for deposits           $ 177    
Blue Jeans Network                
Business Acquisition [Line Items]                
Price payable for acquisitions $ 396              
Goodwill 282              
Intangible assets other than goodwill $ 192