Note 5 - Gross Carrying Amount and Accumulated Amortization by Major Intangible Asset Category (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 85	$ 84
Intangible Assets Net	25
Intangible assets gross	128	131
Intangible assets net	43	47
Trade Names [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	18	21
Technology-Based Intangible Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	99	99
Accumulated Amortization	77	76
Intangible Assets Net	$ 22	$ 23
Weighted-Average Amortization Period	5 years	5 years
Customer-Related Intangible Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11	$ 11
Accumulated Amortization	8	8
Intangible Assets Net	$ 3	$ 3
Weighted-Average Amortization Period	4 years	4 years