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Note 5 - Leases - Summary of Income Recognized on Lease Arrangements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Lease income - operating leases:    
Lease income $ 2 $ 2
Variable lease income [1] 1 1
Total lease income $ 3 $ 3
[1] Variable lease income primarily represents operating costs under real estate leases and incremental variable income based on usage under equipment leases.