Note 4 - Fair Value Measurements (Details) - Amortized Cost and Fair Value of Long-Term Debt - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Note 4 - Fair Value Measurements (Details) - Amortized Cost and Fair Value of Long-Term Debt [Line Items]
Long-term debt carrying amount		$ 3,577	$ 3,781	$ 3,785
Fair Value, Inputs, Level 2 [Member]
Note 4 - Fair Value Measurements (Details) - Amortized Cost and Fair Value of Long-Term Debt [Line Items]
Long-term debt fair value (1)	[1]	$ 3,857	$ 4,231	$ 4,191

[1] Fair value determined using Level 2 inputs.