v3.25.4
Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash $ 3,521      
Cash and cash equivalents $ 18,234 $ 3,298 $ 6,722 $ 3,701
Estimated economic useful life 21 years 2 months 12 days      
Wireless Licenses        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
FCC licenses - typical term (in years) 10 years      
Estimated economic useful life 21 years 3 months 18 days      
Money Market Funds and Other Cash Equivalents        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash equivalents $ 14,713      
Foreign Jurisdictions        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash and cash equivalents $ 1,330      
Minimum | Software        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Amortization period for capitalized software costs 3 years      
Maximum | Software        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Amortization period for capitalized software costs 7 years      
Mexico Segment [Member] | Wireless Licenses        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Estimated economic useful life 25 years