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Business Combinations - Schedule of Amounts Recognized as of Acquisition Date (Details) - USD ($)
$ in Millions
Jul. 01, 2021
Apr. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]        
Goodwill     $ 12,188 $ 11,117
Sprint        
Business Acquisition [Line Items]        
Cash and cash equivalents   $ 2,084    
Accounts receivable   1,775    
Equipment installment plan receivables   1,088    
Inventory   658    
Prepaid expenses   140    
Assets held for sale   1,908    
Other current assets   637    
Property and equipment   18,435    
Operating lease right-of-use assets   6,583    
Financing lease right-of-use assets   291    
Goodwill   9,423    
Spectrum licenses   45,400    
Other intangible assets   6,280    
Equipment installment plan receivables due after one year, net   247    
Other assets   540    
Total assets acquired   95,489    
Accounts payable and accrued liabilities   5,015    
Short-term debt   2,760    
Deferred revenue   508    
Short-term operating lease liabilities   1,818    
Short-term financing lease liabilities   8    
Liabilities held for sale   475    
Other current liabilities   681    
Long-term debt   29,037    
Tower obligations   950    
Deferred tax liabilities   3,478    
Operating lease liabilities   5,615    
Financing lease liabilities   12    
Other long-term liabilities   4,305    
Total liabilities assumed   54,662    
Total consideration exchanged   40,827    
Restricted cash   $ 80    
Shentel        
Business Acquisition [Line Items]        
Inventory $ 2      
Property and equipment 136      
Operating lease right-of-use assets 308      
Goodwill 1,035      
Other intangible assets 770      
Other assets 7      
Total assets acquired 2,258      
Short-term operating lease liabilities 73      
Operating lease liabilities 264      
Other long-term liabilities 35      
Total liabilities assumed 372      
Total consideration exchanged $ 1,886