Note 9 - Non-Wholly Owned Entities (Details) - Equity Method Investments - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 75	$ 80	$ 81
Triton [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments		53	62	65
Horizon Pipeline [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments		14	14	15
Other Equity Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	[1]	$ 8	$ 4	$ 1

[1] Primarily includes our current investments of $3 million in PennEast Pipeline and $4 million in Atlantic Coast Pipeline as of June 30, 2015 and $1 million and $2 million, respectively, as of December 31, 2014.