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Franchises, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Indefinite-lived Intangible Assets:      
Goodwill $ 29,674 $ 29,668  
Indefinite-lived intangible assets and goodwill 97,759 97,687  
Finite-Lived Intangible Assets:      
Gross Carrying Amount 18,747 18,718  
Accumulated Amortization (17,639) (16,801)  
Net Carrying Amount 1,108 1,917  
Amortization expense 838 1,100 $ 1,300
2025 592    
2026 334    
2027 102    
2028 20    
2029 18    
Thereafter 42    
Franchises      
Indefinite-lived Intangible Assets:      
Indefinite-lived intangible assets 67,462 67,396  
Wireless spectrum licenses      
Indefinite-lived Intangible Assets:      
Indefinite-lived intangible assets 464 464  
Trademarks      
Indefinite-lived Intangible Assets:      
Indefinite-lived intangible assets 159 159  
Customer relationships      
Finite-Lived Intangible Assets:      
Gross Carrying Amount 18,294 18,268  
Accumulated Amortization (17,319) (16,523)  
Net Carrying Amount $ 975 1,745  
Customer relationships | Minimum      
Finite-Lived Intangible Assets:      
Customer relationships, useful life 10 years    
Customer relationships | Maximum      
Finite-Lived Intangible Assets:      
Customer relationships, useful life 15 years    
Other intangible assets      
Finite-Lived Intangible Assets:      
Gross Carrying Amount $ 453 450  
Accumulated Amortization (320) (278)  
Net Carrying Amount $ 133 $ 172