Note 5 - Gross Carrying Amount and Accumulated Amortization by Major Intangible Asset Category (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 78	$ 67
Intangible Assets Net	35
Intangible assets gross	138	151
Intangible assets net	60	84
Trade Names [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	25	38
Technology-Based Intangible Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	99	99
Accumulated Amortization	70	60
Intangible Assets Net	$ 29	$ 39
Weighted-Average Amortization Period	6 years	6 years
Customer-Related Intangible Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11	$ 11
Accumulated Amortization	7	6
Intangible Assets Net	$ 4	$ 5
Weighted-Average Amortization Period	5 years	6 years
Other Intangible Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3	$ 3
Accumulated Amortization	1	1
Intangible Assets Net	$ 2	$ 2
Weighted-Average Amortization Period	20 years	21 years