Note 10 - Accounts Receivable (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss, Current	$ 9		$ 9		$ 10
Total Transfer Capacity, Undivided Interests to Investors under Receivables Securitization Facility	800		$ 800
Receivables Securitization Facility, Duration (Year)			3 years
Value Outstanding, Undivided Interest Held by Investors Under Receivables Securitization Facility	600		$ 600		300
Accounts Receivable, Supporting Undivided Investor Held Interest	1,700		1,700		1,300
Interest Expense, Total	316	$ 282	$ 623	$ 572
Asset-Backed Securities, Securitized Loans and Receivables [Member]
Accounts Receivable, from Securitization, Default or Dilution Ratio			1.00%
Interest Expense, Total	3	$ 1	$ 4	$ 2
Maximum [Member]
Total Transfer Capacity, Undivided Interests to Investors under Receivables Securitization Facility	800		800
Other Assets [Member]
Accounts Receivable, Allowance for Credit Loss, Noncurrent	$ 47		$ 47		$ 51