Note 2 - Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Contract with Customer, Liability, Total	$ 1,200		$ 1,300
Increase (Decrease) in Contract with Customer, Liability	83	$ 93
Contract with Customer, Liability, Noncurrent	985		1,100	$ 1,072
Contract with Customer, Liability, Current	236		223	223
Contract With Customer Liability, Deferred Revenue, Noncurrent	751			764
Contract With Customer Liability, Deferred Revenue, Current	136			$ 148
HSG [Member]
Contract with Customer, Liability, Total	887		912
Contract With Customer Liability, Deferred Revenue, Noncurrent	751		764
Contract With Customer Liability, Deferred Revenue, Current	$ 136		$ 148
Maximum [Member]
Long Term Supply, Commitment Period (Year)	10 years