Segment Disclosures (Tables)

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

The following table reflects the reconciliation of Segment revenues to Total revenues as reported in the Consolidated Statement of Operations and Total assets by reportable segment.

	Williams Partners		Williams NGL & Petchem Services (1)		Other		Eliminations			Total
	(Millions)
Three Months Ended September 30, 2015
Segment revenues:
Service revenues
External	$	1,232	$	1	$	6	$	—		$	1,239
Internal	—		—		64		(64		)	—
Total service revenues	1,232		1		70		(64		)	1,239
Product sales
External	560		—		—		—			560
Internal	—		—		—		—			—
Total product sales	560		—		—		—			560
Total revenues	$	1,792	$	1	$	70	$	(64	)	$	1,799
Three Months Ended September 30, 2014
Segment revenues:
Service revenues
External	$	1,065	$	—	$	62	$	—		$	1,127
Internal	1		—		7		(8		)	—
Total service revenues	1,066		—		69		(8		)	1,127
Product sales
External	942		—		—		—			942
Internal	—		—		—		—			—
Total product sales	942		—		—		—			942
Total revenues	$	2,008	$	—	$	69	$	(8	)	$	2,069

	Williams Partners		Williams NGL & Petchem Services (1)		Other		Eliminations			Total
	(Millions)
Nine Months Ended September 30, 2015
Segment revenues:
Service revenues
External	$	3,655	$	2	$	20	$	—		$	3,677
Internal	—		—		123		(123		)	—
Total service revenues	3,655		2		143		(123		)	3,677
Product sales
External	1,677		—		—		—			1,677
Internal	1		—		—		(1		)	—
Total product sales	1,678		—		—		(1		)	1,677
Total revenues	$	5,333	$	2	$	143	$	(124	)	$	5,354
Nine Months Ended September 30, 2014
Segment revenues:
Service revenues
External	$	2,591	$	—	$	180	$	—		$	2,771
Internal	1		—		14		(15		)	—
Total service revenues	2,592		—		194		(15		)	2,771
Product sales
External	2,725		—		—		—			2,725
Internal	—		—		—		—			—
Total product sales	2,725		—		—		—			2,725
Total revenues	$	5,317	$	—	$	194	$	(15	)	$	5,496
September 30, 2015
Total assets	$	49,639	$	802	$	999	$	(621	)	$	50,819
December 31, 2014
Total assets	$	49,322	$	612	$	1,220	$	(591	)	$	50,563

_______________

(1) Includes certain projects under development and thus nominal reported revenues to date.

Reconciliation of Modified EBITDA to Segment to Consolidated [Table Text Block]

The following table reflects the reconciliation of Modified EBITDA to Net income (loss) as reported in the Consolidated Statement of Operations.

	Three Months Ended   September 30,						Nine Months Ended   September 30,
	2015			2014			2015			2014
	(Millions)
Modified EBITDA by Segment:
Williams Partners	$	1,021		$	843		$	2,891		$	2,147
Williams NGL & Petchem Services	(5		)	(4		)	(13		)	(112		)
Other	(17		)	(17		)	(21		)	101
	999			822			2,857			2,136
Accretion expense associated with asset retirement obligations for nonregulated operations	(6		)	(4		)	(21		)	(13		)
Depreciation and amortization expenses	(432		)	(369		)	(1,287		)	(797		)
Equity earnings (losses)	92			66			236			55
Gain on remeasurement of equity-method investment	—			2,522			—			2,522
Impairment of equity-method investments	(461		)	—			(461		)	—
Other investing income (loss) – net	18			11			27			43
Proportional Modified EBITDA of equity-method investments	(185		)	(132		)	(504		)	(273		)
Interest expense	(263		)	(210		)	(776		)	(513		)
(Provision) benefit for income taxes	65			(998		)	(48		)	(1,133		)
Income (loss) from discontinued operations, net of tax	—			—			—			4
Net income (loss)	$	(173	)	$	1,708		$	23		$	2,031