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Note 9 - Accounts Receivable (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
Accounts Receivable, Allowance for Credit Loss, Current $ 11   $ 11   $ 10
Total Transfer Capacity, Undivided Interests to Investors under Receivables Securitization Facility 800   $ 800    
Receivables Securitization Facility, Duration (Year)     3 years    
Receivables Securitization Facility, Maturity Date     Jul. 31, 2025    
Value Outstanding, Undivided Interest Held by Investors Under Receivables Securitization Facility 400   $ 400   100
Accounts Receivable, Supporting Undivided Investor Held Interest 1,500   1,500   1,600
Interest Expense 339 $ 316 $ 675 $ 623  
Asset-Backed Securities, Securitized Loans and Receivables [Member]          
Accounts Receivable, from Securitization, Default or Dilution Ratio     1.00%    
Interest Expense 1 $ 3 $ 4 $ 4  
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 $ 67   $ 67   $ 58