XML 64 R50.htm IDEA: XBRL DOCUMENT v3.21.2
Goodwill, Spectrum License Transactions and Other Intangible Assets - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2021
USD ($)
Apr. 01, 2020
USD ($)
Mar. 31, 2021
USD ($)
license
Oct. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Goodwill [Line Items]                  
Goodwill from acquisition                 $ 9,405
Purchase of spectrum licenses         $ 407   $ 9,337 $ 827  
Amortization expense for intangible assets         $ 316 $ 383 $ 977 $ 794  
Reacquired rights | Maximum                  
Goodwill [Line Items]                  
Intangible assets, useful life (in years)             9 years    
Licensing Agreements | Auction 107                  
Goodwill [Line Items]                  
Number of licenses | license     142            
Aggregate purchase price     $ 9,300            
Purchase of spectrum licenses     $ 8,900 $ 438          
Expected remaining cost             $ 1,000    
Sprint                  
Goodwill [Line Items]                  
Goodwill from acquisition   $ 9,400              
Sprint | Favorable lease (asset)                  
Goodwill [Line Items]                  
Finite-lived, fair value   $ 745              
Weighted average useful life   18 years              
Sprint | Unfavorable spectrum leases                  
Goodwill [Line Items]                  
Finite-lived, fair value   $ 125              
Weighted average useful life   19 years              
Sprint | Customer relationships                  
Goodwill [Line Items]                  
Finite-lived, fair value   $ 4,900              
Weighted average useful life   8 years              
Sprint | Spectrum Licenses                  
Goodwill [Line Items]                  
Fixed period   15 years              
Shentel                  
Goodwill [Line Items]                  
Goodwill from acquisition $ 1,000                
Finite-lived, fair value $ 770                
Weighted average useful life 9 years