Note 8 - Non-Wholly Owned Entities (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended			12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Triton [Member]	Jun. 30, 2012 Triton [Member]	Jun. 30, 2012 Horizon Pipeline [Member]	Jun. 30, 2012 Horizon Pipeline [Member]	Jun. 30, 2012 South Star [Member]	Jun. 30, 2011 South Star [Member]	Dec. 31, 2011 South Star [Member]	Jun. 30, 2012 South Star [Member]
Payments to Acquire Property, Plant, and Equipment	$ 350	$ 196					$ 1	$ 1	$ 2
Payments of Ordinary Dividends, Noncontrolling Interest	14	16
Decrease Earnings VIE	2
Noncontrolling Interest, Ownership Percentage by Parent										85.00%
Equity Method Investment, Summarized Financial Information, Net Income (Loss)			$ 3	$ 6	$ 1	$ 1