Note 3 - Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Oct. 01, 2019	Jan. 02, 2019	Dec. 31, 2018
Goodwill	$ 1,460	$ 1,446			$ 612
Alaska Transactions [Member]
Accounts receivable and other current assets	1
Property and equipment	5
Goodwill	2
Broadcast licenses	2
Other intangible assets	9
Total	19
Columbus Acquisition [Member]
Accounts receivable and other current assets	0
Property and equipment	2
Goodwill	1
Broadcast licenses	0
Other intangible assets	19
Total	22
Sioux Falls Acquisition [Member]
Accounts receivable and other current assets	0
Property and equipment	0	10
Goodwill	11	2	$ 2
Broadcast licenses	0
Other intangible assets	11	7
Total	22	33
Cash		0
Accounts receivable, net		1
Program broadcast rights		0
Other current assets		0
Operating lease right of use asset		0
Broadcast licenses		14
Other non-current assets		0
Employee compensation and benefits		0
Program broadcast obligations		0
Other current liabilities		(1)
Federal and state income taxes payable		0
Deferred income taxes		0
Operating lease liabilities		0
Other long-term liabilities		0
The 2020 Acquisitions [Member]
Accounts receivable and other current assets	1
Property and equipment	7
Goodwill	14
Broadcast licenses	2
Other intangible assets	39
Total	$ 63
Raycom [Member]
Property and equipment		311
Goodwill		829		$ 829
Other intangible assets		504
Total		3,443
Cash		115
Accounts receivable, net		243
Program broadcast rights		12
Other current assets		10
Operating lease right of use asset		52
Broadcast licenses		2,004
Other non-current assets		20
Employee compensation and benefits		(29)
Program broadcast obligations		(16)
Other current liabilities		(60)
Federal and state income taxes payable		(3)
Deferred income taxes		(472)
Operating lease liabilities		(52)
Other long-term liabilities		(25)
United Acquisition [Member]
Property and equipment		10
Goodwill		3
Other intangible assets		8
Total		48
Cash		0
Accounts receivable, net		3
Program broadcast rights		0
Other current assets		0
Operating lease right of use asset		0
Broadcast licenses		24
Other non-current assets		0
Employee compensation and benefits		0
Program broadcast obligations		0
Other current liabilities		0
Federal and state income taxes payable		0
Deferred income taxes		0
Operating lease liabilities		0
Other long-term liabilities		0
Charlottesville Acquisition [Member]
Property and equipment		7
Goodwill		0
Other intangible assets		3
Total		13
Cash		0
Accounts receivable, net		1
Program broadcast rights		0
Other current assets		0
Operating lease right of use asset		0
Broadcast licenses		2
Other non-current assets		0
Employee compensation and benefits		0
Program broadcast obligations		0
Other current liabilities		0
Federal and state income taxes payable		0
Deferred income taxes		0
Operating lease liabilities		0
Other long-term liabilities		0
Acquisitions 2019 [Member]
Property and equipment		338
Goodwill		834
Other intangible assets		522
Total		3,537
Cash		115
Accounts receivable, net		248
Program broadcast rights		12
Other current assets		10
Operating lease right of use asset		52
Broadcast licenses		2,044
Other non-current assets		20
Employee compensation and benefits		(29)
Program broadcast obligations		(16)
Other current liabilities		(61)
Federal and state income taxes payable		(3)
Deferred income taxes		(472)
Operating lease liabilities		(52)
Other long-term liabilities		$ (25)