v3.25.4
Stockholders' and Mezzanine Equity (Preferred Interest Narrative) (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2028
USD ($)
Dec. 31, 2025
USD ($)
period
$ / shares
Rate
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2025
USD ($)
Apr. 30, 2023
USD ($)
Noncontrolling Interest [Line Items]              
Redemption of nonconvertible cumulative preferred interests in subsidiary     $ 65 $ 0 $ 5,333    
Mobility II, LLC | Preferred Stock – Series A              
Noncontrolling Interest [Line Items]              
Preferred interest, securities issued (in shares) | shares     320,000,000        
Preferred stock, dividend rate     7.00%        
Mobility II, LLC | Preferred Stock – Series B              
Noncontrolling Interest [Line Items]              
Preferred interest, securities issued (in shares) | shares     2,000,000        
Initial preferred distribution percentage     6.80%        
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount $ 2,000   $ 2,000        
Put or redemption option, minimum exercise price calculation, value added to accrued and unpaid distributions (in dollars per share) | $ / shares     $ 1,000        
Tower Holdings              
Noncontrolling Interest [Line Items]              
Preferred interest issued 6,000   $ 6,000        
Fixed future purchase option price     $ 6,000        
Distribution reset period     5 years        
Option to require redemption, certain contingent events, failure of subsidiary to pay preferred distributions, minimum number of periods | period     2        
Tower Holdings | Class A-1              
Noncontrolling Interest [Line Items]              
Preferred interest issued       1,500      
Initial preferred distribution percentage     5.00%        
Tower Holdings | Class A-2              
Noncontrolling Interest [Line Items]              
Preferred interest issued       4,500      
Initial preferred distribution percentage     4.75%        
Tower Holdings | Tower Fixed Rate Interests              
Noncontrolling Interest [Line Items]              
Initial preferred distribution percentage     5.90%        
Secured Overnight Financing Rate, Basis Spread | Rate     2.50%        
Tower Holdings | Tower Floating Rate Interests              
Noncontrolling Interest [Line Items]              
Redemption of nonconvertible cumulative preferred interests in subsidiary 65            
Tower Holdings | Tower Floating Rate Interests | Forecast              
Noncontrolling Interest [Line Items]              
Preferred interest distributions   $ 460          
Telco LLC              
Noncontrolling Interest [Line Items]              
Period post issuance date that preferred interests can be called at issue price     7 years        
Telco LLC | Preferred Stock – Series A              
Noncontrolling Interest [Line Items]              
Preferred interest issued 9,500   $ 9,500 $ 7,250      
Option to require redemption, certain contingent events, failure of subsidiary to pay preferred distributions, minimum number of periods | period     2        
Telco LLC | Class A-1              
Noncontrolling Interest [Line Items]              
Preferred interest issued $ 2,000   $ 2,000        
Initial preferred distribution percentage     4.25%        
Distribution reset period     7 years        
Telco LLC | Class A-2 and Class A-3              
Noncontrolling Interest [Line Items]              
Preferred interest issued             $ 5,250
Initial preferred distribution percentage     6.85%        
Period post issuance date that preferred interests can be called at issue price     7 years        
Telco LLC | Class A-4              
Noncontrolling Interest [Line Items]              
Preferred interest issued           $ 2,250  
Initial preferred distribution percentage     5.94%        
Distribution reset period     4 years