v3.21.2
Business Combinations - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 28, 2021
Apr. 01, 2020
Feb. 20, 2020
Aug. 03, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Business Acquisition [Line Items]                  
Goodwill         $ 11,152,000,000   $ 11,152,000,000   $ 11,117,000,000
Transaction costs         $ 0        
Sprint                  
Business Acquisition [Line Items]                  
Exchange ratio (in shares)   9.75              
Exchange ratio (in shares)   0.10256              
Merger consideration (in shares)   373,396,310              
Value of common stock provided in exchange for acquiree common stock   $ 31,328,000,000              
Fully-diluted shares of combined company held by public stockholders (percent)   31.70%              
Value of contingent consideration   $ 1,882,000,000              
Contingent consideration, high end of range   7,300,000,000              
Goodwill   9,423,000,000              
Goodwill expected to be tax deductible   0              
Spectrum licenses   45,400,000,000              
Deferred tax assets   851,000,000              
Uncertain tax benefit reserves   660,000,000              
Transaction costs           $ 145,000,000 $ 13,000,000 $ 184,000,000  
Total consideration exchanged   40,827,000,000              
Sprint | Pro Forma                  
Business Acquisition [Line Items]                  
Transaction costs           $ 145,000,000   $ 202,000,000  
Sprint | SoftBank                  
Business Acquisition [Line Items]                  
Value of contingent consideration   200,000,000              
Indemnification assets   200,000,000              
Sprint | Accounts Receivable                  
Business Acquisition [Line Items]                  
Fair value of receivables acquired   1,800,000,000              
Gross amounts due   1,800,000,000              
Sprint | Equipment installment plan receivables, net of allowance for credit losses and imputed discount                  
Business Acquisition [Line Items]                  
Fair value of receivables acquired   1,300,000,000              
Gross amounts due   1,600,000,000              
Sprint | Customer relationships                  
Business Acquisition [Line Items]                  
Finite-lived, fair value   $ 4,900,000,000              
Weighted average useful life   8 years              
Sprint | Tradenames                  
Business Acquisition [Line Items]                  
Finite-lived, fair value   $ 207,000,000              
Weighted average useful life   2 years              
Sprint | Favorable lease (asset)                  
Business Acquisition [Line Items]                  
Finite-lived, fair value   $ 745,000,000              
Weighted average useful life   18 years              
Sprint | Unfavorable spectrum leases                  
Business Acquisition [Line Items]                  
Finite-lived, fair value   $ 125,000,000              
Weighted average useful life   19 years              
Sprint | SoftBank                  
Business Acquisition [Line Items]                  
Fully-diluted shares expected to be held immediately following merger (percent)   24.70%              
Sprint | DT                  
Business Acquisition [Line Items]                  
Fully-diluted shares expected to be held immediately following merger (percent)   43.60%              
Sprint | Common Stock                  
Business Acquisition [Line Items]                  
Exchange ratio (in shares)     11.00            
Sprint | Common Stock | SoftBank                  
Business Acquisition [Line Items]                  
Aggregate surrendered (in shares)     48,751,557            
Exchange ratio (in shares)     11.31            
Volume-weighted average price (in USD per share)     $ 150.00            
Number of shares issued if threshold not met (in shares)     0            
Shentel                  
Business Acquisition [Line Items]                  
Agreement price $ 1,900,000,000                
Shentel | Subsequent Event                  
Business Acquisition [Line Items]                  
Cash consideration       $ 2,000,000,000.0          
Total consideration exchanged       $ 1,900,000,000