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Note 11 - Goodwill and Intangible Assets - Changes in Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Goodwill $ 1,466 $ 1,460   $ 1,460  
Goodwill, Net additions   6   6  
Goodwill 1,466 1,466   1,466  
Broadcast licenses   3,579   3,579  
Broadcast licenses 3,584     3,584  
Finite-lived intangible assets   395   395  
Finite-lived intangible assets, Net additions       7  
Amortization of Intangible Assets (27)   $ (26) (53) $ (52)
Finite-lived intangible assets 349     349  
Total intangible assets net of accumulated amortization   5,434   5,434  
Total intangible assets net of accumulated amortization, Net additions       18  
Total intangible assets net of accumulated amortization 5,399     5,399  
Goodwill, gross   1,559   1,559  
Goodwill, impairments   0   0  
Goodwill, gross 1,565     1,565  
Accumulated goodwill impairment   (99)   (99)  
Accumulated goodwill impairment (99)     (99)  
Broadcast Licenses [Member]          
Broadcast licenses   $ 3,579   3,579  
Broadcast licenses, Net additions       5  
Broadcast licenses $ 3,584     $ 3,584