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Franchises, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Indefinite-lived Intangible Assets:      
Goodwill $ 29,562 $ 29,554  
Indefinite-lived intangible assets and goodwill 97,531 97,499  
Finite-Lived Intangible Assets:      
Gross Carrying Amount 18,670 18,650  
Accumulated Amortization (14,376) (12,774)  
Net Carrying Amount 4,294 5,876  
Amortization expense 1,600 1,900 $ 2,200
2022 1,336    
2023 1,079    
2024 828    
2025 579    
2026 321    
Thereafter 151    
Franchises      
Indefinite-lived Intangible Assets:      
Indefinite-lived intangible assets 67,346 67,322  
Wireless spectrum licenses      
Indefinite-lived Intangible Assets:      
Indefinite-lived intangible assets 464 464  
Indefinite-lived Intangible Assets Acquired   464  
Trademarks      
Indefinite-lived Intangible Assets:      
Indefinite-lived intangible assets 159 159  
Customer relationships      
Finite-Lived Intangible Assets:      
Gross Carrying Amount 18,240 18,230  
Accumulated Amortization (14,180) (12,615)  
Net Carrying Amount $ 4,060 5,615  
Customer relationships | Minimum      
Finite-Lived Intangible Assets:      
Customer relationships, useful life 8 years    
Customer relationships | Maximum      
Finite-Lived Intangible Assets:      
Customer relationships, useful life 15 years    
Other intangible assets      
Finite-Lived Intangible Assets:      
Gross Carrying Amount $ 430 420  
Accumulated Amortization (196) (159)  
Net Carrying Amount $ 234 $ 261