v3.26.3
Acquisitions and Divestitures - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 28, 2026
USD ($)
Jun. 01, 2026
USD ($)
Jan. 20, 2026
USD ($)
state
$ / shares
Sep. 30, 2026
USD ($)
state
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
segment
state
Sep. 30, 2025
USD ($)
Jan. 30, 2026
market
Dec. 31, 2025
USD ($)
Business Combination [Line Items]                  
Acquisitions of wireless licenses           $ 4,384 $ 340    
Loss on disposition of business       $ 0 $ 0 $ 746 $ 0    
Number of states in which wireline services are provided | state     31            
Number of reportable segments | segment           2      
Goodwill       $ 30,729   $ 30,729     $ 22,841
Jasper NewCo Limited                  
Business Combination [Line Items]                  
Equity method investment, ownership percentage 50.00%                
Payments to acquire interest in joint venture $ 625                
Disposal Group, Held-for-Sale, Not Discontinued Operations | Verizon Contributed Business                  
Business Combination [Line Items]                  
Loss on disposition of business           $ 740      
Consumer                  
Business Combination [Line Items]                  
Number of states in which wireline services are provided | state       31   31      
Spectrum Licenses, United States Cellular Corporation (UScellular)                  
Business Combination [Line Items]                  
Asset acquisition, consideration transferred   $ 1,000              
82 Spectrum Licenses | Spectrum Licenses                  
Business Combination [Line Items]                  
Acquisitions of wireless licenses           $ 3,200      
Frontier and Starry                  
Business Combination [Line Items]                  
Business combination, aggregate acquired operating revenues, percentage of total operating revenues (less than)       5.00%   5.00%      
Frontier                  
Business Combination [Line Items]                  
Business acquisition, share price (in dollars per share) | $ / shares     $ 38.50            
Cash payment to Frontier's equity holders     $ 9,800            
Cash proceeds from acquisition     335            
Business combination, consideration transferred, liabilities incurred     12,900            
Goodwill     7,759 $ 7,860   $ 7,860      
Business combination, recognized asset acquired, benefit obligation assets     2,500            
Business combination, recognized liability assumed, liability, employee benefit obligations     3,000            
Repayments of assumed debt           12,400      
Business combination, integration and acquisition-related cost, expense       $ 45   $ 426      
Frontier | Customer-Related Intangible Assets                  
Business Combination [Line Items]                  
Finite-lived intangible assets acquired     $ 2,900            
Acquired finite-lived intangible assets, weighted average useful life     9 years            
Frontier | Technology-Based Intangible Assets                  
Business Combination [Line Items]                  
Finite-lived intangible assets acquired     $ 163            
Acquired finite-lived intangible assets, weighted average useful life     3 years            
Frontier | Trade Names                  
Business Combination [Line Items]                  
Finite-lived intangible assets acquired     $ 100            
Acquired finite-lived intangible assets, weighted average useful life     3 years            
Frontier | Consumer                  
Business Combination [Line Items]                  
Goodwill     $ 6,100            
Frontier | Business                  
Business Combination [Line Items]                  
Goodwill     $ 1,800            
Starry Group Holdings, Inc.                  
Business Combination [Line Items]                  
Number of markets serviced | market               5