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Note 5 - Fair Value Measurement (Details Textual) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Long-term Debt, Total	$ 3,981	$ 3,974
Long-term Debt, Fair Value	$ 4,100	$ 4,100

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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