Note 3 - Fair Value Measurements (Details) - Amortized Cost and Fair Value of Long-Term Debt (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
Note 3 - Fair Value Measurements (Details) - Amortized Cost and Fair Value of Long-Term Debt [Line Items]
Long-term debt amortized cost	$ 3,819		$ 3,553		$ 3,565
Fair Value, Inputs, Level 2 [Member]
Note 3 - Fair Value Measurements (Details) - Amortized Cost and Fair Value of Long-Term Debt [Line Items]
Long-term debt fair value (1)	$ 4,070	[1]	$ 4,057	[1]	$ 4,043	[1]

[1] Fair value determined using Level 2 inputs.