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Franchises, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Indefinite-lived Intangible Assets:      
Goodwill $ 29,554   $ 29,554
Indefinite-lived intangible assets and goodwill 97,499   97,499
Finite-lived Intangible Assets:      
Gross Carrying Amount 18,650   18,650
Accumulated Amortization (13,214)   (12,774)
Net Carrying Amount 5,436   5,876
Amortization expense 440 $ 508  
Nine months ended December 31, 2021 1,162    
Finite-Lived Intangible Asset, Expected Amortization, Year One 1,332    
2022 1,075    
2023 824    
2024 575    
Thereafter 468    
Franchises      
Indefinite-lived Intangible Assets:      
Indefinite-lived intangible assets 67,322   67,322
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 18,230   18,230
Accumulated Amortization (13,045)   (12,615)
Net Carrying Amount 5,185   5,615
Other intangible assets      
Finite-lived Intangible Assets:      
Gross Carrying Amount 420   420
Accumulated Amortization (169)   (159)
Net Carrying Amount $ 251   $ 261