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Note 7 - Summary of Income Recognized on Operating Lease Arrangements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Lease income - operating leases:        
Lease income $ 2 $ 2 $ 6 $ 6
Sublease income       2
Variable lease income 1 1 3 3
Total lease income $ 3 $ 3 $ 9 $ 11