Note 3 - Acquisitions and Divestitures - Consideration (Details) - Quincy Acquisition [Member] - USD ($) $ in Millions		12 Months Ended
Aug. 02, 2021	Dec. 31, 2021	Dec. 31, 2023
Adjusted purchase price	$ 936	$ 936
Less - consideration allocated to assets acquired and liabilities assumed for the Quincy overlap markets thatwere divested on August 2, 2021		383
Purchase consideration for assets acquired and liabilities assumed, net of divestitures		$ 553	$ 553

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 30
-Paragraph 8
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479637/805-30-30-8

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 30
-Paragraph 7
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479637/805-30-30-7

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