Note 2 - Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Contract with Customer, Liability, Customer Deposits	$ 1,200		$ 1,200		$ 1,300
Increase (Decrease) in Contract with Customer, Liability	12	$ 48	82	$ 131
HSG [Member]
Contract with Customer, Liability	$ 840		$ 840		$ 869
Maximum [Member]
Long Term Supply, Commitment Period (Year)			10 years