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Franchises, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Indefinite-lived Intangible Assets:      
Goodwill $ 29,554 $ 29,554  
Indefinite-lived intangible assets and goodwill 97,035 97,032  
Finite-Lived Intangible Assets:      
Gross Carrying Amount 18,635 18,638  
Accumulated Amortization (10,899) (8,756)  
Net Carrying Amount 7,736 9,882  
Amortization expense 2,200 2,400 $ 2,700
2020 1,874    
2021 1,599    
2022 1,329    
2023 1,072    
2024 821    
Thereafter 1,041    
Franchises      
Indefinite-lived Intangible Assets:      
Indefinite-lived intangible assets 67,322 67,319  
Trademarks      
Indefinite-lived Intangible Assets:      
Indefinite-lived intangible assets 159 159  
Customer relationships      
Finite-Lived Intangible Assets:      
Gross Carrying Amount 18,230 18,229  
Accumulated Amortization (10,777) (8,664)  
Net Carrying Amount $ 7,453 9,565  
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 $ 405 409  
Accumulated Amortization (122) (92)  
Net Carrying Amount $ 283 $ 317