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Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue $ 792 $ 604 $ 451 $ 534 $ 579 $ 517 $ 508 $ 518 $ 2,381 $ 2,122 $ 1,084
Sales Channel, Directly to Consumer [Member]                      
Revenue                 1,302 1,270 552
Sales Channel, Through Intermediary [Member]                      
Revenue                 1,079 852 532
Local Advertising [Member]                      
Revenue                 771 898 443
National Advertising [Member]                      
Revenue                 198 229 114
Political Advertising [Member]                      
Revenue                 430 68 155
Advertising [Member]                      
Revenue                 1,399 1,195 712
Retransmission Consent [Member]                      
Revenue                 867 796 355
Production Companies [Member]                      
Revenue                 61 87 0
Service, Other [Member]                      
Revenue                 $ 54 $ 44 $ 17