Note 2 - Significant Accounting Policies and Methods of Application (Detail) - Credit Exposure (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Credit exposure (in Dollars)	$ 211	[1]
Credit exposure	20
Credit exposure	50.00%

[1] Our counterparties or the counterparties' guarantors had a weighted average S&P equivalent rating of A- at December 31, 2012.