Note 3 - Fair Value Measurements (Detail) - Amortized Cost and Fair Value of Long-Term Debt (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Long-term debt amortized cost	$ 3,550		$ 3,553		$ 3,575
Fair Value, Inputs, Level 2 [Member]
Long-term debt fair value (1)	$ 4,006	[1]	$ 4,057	[1]	$ 3,922	[1]

[1] Fair value determined using Level 2 inputs.