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Franchises, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Indefinite-lived Intangible Assets:          
Goodwill $ 29,554   $ 29,554   $ 29,554
Indefinite-lived intangible assets and goodwill 97,499   97,499   97,499
Finite-lived Intangible Assets:          
Gross Carrying Amount 18,652   18,652   18,650
Accumulated Amortization (14,000)   (14,000)   (12,774)
Net Carrying Amount 4,652   4,652   5,876
Amortization expense 377 $ 445 1,200 $ 1,400  
Three months ended December 31, 2021 375   375    
2022 1,332   1,332    
2023 1,075   1,075    
2024 824   824    
2025 576   576    
Thereafter 470   470    
Franchises          
Indefinite-lived Intangible Assets:          
Indefinite-lived intangible assets 67,322   67,322   67,322
Wireless spectrum licenses          
Indefinite-lived Intangible Assets:          
Indefinite-lived intangible assets 464   464   464
Trademarks          
Indefinite-lived Intangible Assets:          
Indefinite-lived intangible assets 159   159   159
Customer relationships          
Finite-lived Intangible Assets:          
Gross Carrying Amount 18,232   18,232   18,230
Accumulated Amortization (13,813)   (13,813)   (12,615)
Net Carrying Amount 4,419   4,419   5,615
Other intangible assets          
Finite-lived Intangible Assets:          
Gross Carrying Amount 420   420   420
Accumulated Amortization (187)   (187)   (159)
Net Carrying Amount $ 233   $ 233   $ 261