v3.20.4
Acquisitions, Dispositions And Other Adjustments (Spectrum Auctions Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Licensing Agreements          
Indefinite-lived Intangible Assets [Line Items]          
Payments to acquire intangible assets $ 2,379   $ 949   $ 1,186
24 GHz Licenses          
Indefinite-lived Intangible Assets [Line Items]          
Payments to acquire intangible assets   $ 982      
FiberTower Corporation | 39 GHz Licenses          
Indefinite-lived Intangible Assets [Line Items]          
Book value of indefinite-lived intangible assets       $ 300  
Gain on disposition of intangible asset       $ 900  
Value of consideration received in a noncash transaction         $ 1,200