Note 8 - Non-Wholly Owned Entities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Payments to Acquire Property, Plant, and Equipment	$ 148	$ 171
Payments of Ordinary Dividends, Noncontrolling Interest	17	14
Increase Decrease In Payments Of Dividends Minority Interest	3
Triton [Member]
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	2	3
Other Equity Investments [Member]
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	1
South Star [Member]
Payments to Acquire Property, Plant, and Equipment	$ 1	$ 1	$ 1