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Note 7 - Summary of Income Recognized on Operating Lease Arrangements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lease income - operating leases:    
Lease income $ 2 $ 2
Sublease income   2
Variable lease income 1 1
Total lease income $ 3 $ 5