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Note 10 - Summary of Income Recognized on Operating Lease Arrangements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Lease income - operating leases:    
Lease income $ 2 $ 2
Sublease income 2 2
Variable lease income 1 1
Total lease income $ 5 $ 5