Asset Impairments (Tables)

9 Months Ended

Sep. 30, 2016

Asset Impairment Charges [Abstract]

Components of Asset Impairments

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
	(Millions)
U.S. oil and gas assets	$	317	$	4,715	$	2,810	$	14,340
Canada oil and gas assets		—		336		1,166		336
EnLink goodwill		—		576		873		576
EnLink other intangible assets		—		223		—		223
Other assets		2		1		2		4
Total asset impairments	$	319	$	5,851	$	4,851	$	15,479