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, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 77	$ 69
Intangible Assets Net	73
Intangible assets gross	190	190
Intangible assets net	113	121
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	40	40
Technology-Based Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	122	122
Accumulated Amortization	65	57
Intangible Assets Net	$ 57	$ 65
Weighted-Average Amortization Period	6 years	6 years
Customer-Related Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 26	$ 26
Accumulated Amortization	12	12
Intangible Assets Net	$ 14	$ 14
Weighted-Average Amortization Period	6 years	6 years
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2	$ 2
Intangible Assets Net	$ 2	$ 2
Weighted-Average Amortization Period	21 years	21 years