Investing Activities (Tables)

12 Months Ended

Dec. 31, 2016

Impairment of equity-method investments

The following table presents other-than-temporary impairment charges related to certain equity-method investments (see Note 17 – Fair Value Measurements, Guarantees, and Concentration of Credit Risk):



	Years Ended December 31,
	2016		2015
	(Millions)
Williams Partners
Appalachia Midstream Investments	$	294	$	562
DBJV	59		503
Laurel Mountain	50		45
UEOM	—		241
Ranch Westex	24		—
Other	3		8
	$	430	$	1,359

Investments [Table Text Block]

Investments



	Ownership Interest at December 31, 2016	December 31,
	Ownership Interest at December 31, 2016	2016		2015
		(Millions)
Equity-method investments:
Appalachia Midstream Investments	(1)	$	2,062	$	2,464
UEOM	62%	1,448		1,525
DBJV	50%	988		977
Discovery	60%	572		602
OPPL	50%	430		445
Caiman II	58%	426		418
Laurel Mountain	69%	324		391
Gulfstream	50%	261		293
Other	Various	190		221
		$	6,701	$	7,336

___________


(1)	Includes equity-method investments in multiple gathering systems in the Marcellus Shale with an approximate average 41 percent interest.

Contributions [Table Text Block]

Purchases of and contributions to equity-method investments

We generally fund our portion of significant expansion or development projects of these investees through additional capital contributions. These transactions increased the carrying value of our investments and included:



	Years Ended December 31,
	2016		2015		2014
	(Millions)
DBJV	$	105	$	57	$	20
Appalachia Midstream Investments	28		93		84
Caiman II	22		—		175
UEOM	—		357		57
Discovery	—		35		106
Other	22		53		40
	$	177	$	595	$	482

Dividends and distributions [Table Text Block]

Dividends and distributions

The organizational documents of entities in which we have an equity-method interest generally require distribution of available cash to members on at least a quarterly basis. These transactions reduced the carrying value of our investments and included:



	Years Ended December 31,
	2016		2015		2014
	(Millions)
Appalachia Midstream Investments	$	211	$	219	$	130
Discovery	141		116		36
Gulfstream	100		88		81
UEOM	92		42		—
OPPL	69		45		27
Caiman II	40		33		13
DBJV	39		33		—
Laurel Mountain	28		31		39
ACMP	—		—		64
Other	22		26		50
	$	742	$	633	$	440

Summarized Financial Position and Results of Operations of Equity Method Investments [Table Text Block]

Summarized Financial Position and Results of Operations of All Equity-Method Investments



	December 31,
	2016			2015
	(Millions)
Assets (liabilities):
Current assets	$	508		$	773
Noncurrent assets	9,695			9,549
Current liabilities	(412		)	(633		)
Noncurrent liabilities	(1,484		)	(1,450		)



	Years Ended December 31,
	2016		2015		2014
	(Millions)
Gross revenue	$	1,883	$	1,707	$	1,623
Operating income	799		690		534
Net income	726		611		460