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Note 9 - Summary of Undiscounted Cash Flows to Be Received for Net Investment in Sales-type Leases (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Capital Leases Future Minimum Payments Receivable [Abstract]    
Q4 2019 $ 1  
2020 2  
2021 1  
2022 and thereafter 1  
Total minimum lease payments 5  
Less: unearned interest (1)  
Net investment in sales-type leases $ 4 $ 3