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Note 10 - Goodwill and Intangible Assets - Changes in Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Goodwill     $ 1,446  
Goodwill, Net additions     0  
Goodwill $ 1,446   1,446  
Broadcast licenses     3,573  
Broadcast licenses 3,574   3,574  
Finite-lived intangible assets     460  
Finite-lived intangible assets, Net additions     0  
Amortization of Intangible Assets (26) $ (28) (52) $ (57)
Finite-lived intangible assets 408   408  
Total intangible assets net of accumulated amortization     5,479  
Total intangible assets net of accumulated amortization, Net additions     1  
Total intangible assets net of accumulated amortization 5,428   5,428  
Broadcast Licenses [Member]        
Broadcast licenses     3,573  
Broadcast licenses, Net additions     1  
Broadcast licenses $ 3,574   $ 3,574