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Note 9 - Equipment Subject to Operating Leases and Related Accumulated Depreciation (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Equipment Subject To Operating Leases [Abstract]    
Equipment subject to operating leases $ 36 $ 34
Accumulated depreciation (21) (19)
Equipment subject to operating leases, net $ 15 $ 15