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Note 9 - Summary of Income Recognized on Operating Lease Arrangements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lease income - operating leases:    
Lease income $ 3 $ 7
Sublease income 1 5
Variable lease income 1 3
Total lease income $ 5 $ 15