Investing Activities (Tables)

9 Months Ended

Sep. 30, 2016

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investment Summarized Financial Position And Results Of Operations [Table Text Block]

Summarized Results of Operations for Certain Equity-Method Investments

The table below presents aggregated selected income statement data for our investments in Discovery, Gulfstream, and Appalachia Midstream Investments, which are considered significant.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
	(Millions)
Gross revenue	$	226	$	241	$	648	$	658
Operating income	132		131		376		334
Net income	117		113		321		281