Segment Disclosures (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

The following geographic area data includes Revenues from external customers based on product shipment origin and Long-lived assets based upon physical location.

			United States		Canada		Total
			(Millions)
Revenues from external customers:
	2014	$	7,229	$	408	$	7,637
	2013		6,703		157		6,860
	2012		7,335		151		7,486
Long-lived assets:
	2014	$	38,290	$	1,364	$	39,654
	2013		19,260		1,240		20,500
	2012		16,940		880		17,820

Reconciliation of segment revenues and segment profit (loss) [Table Text Block]

The following table reflects the reconciliation of Segment revenues and Segment profit (loss) to Total revenues and Operating income (loss) as reported in the Consolidated Statement of Income and Other financial information related to Long-lived assets.

	Williams Partners			Access Midstream		Williams NGL & Petchem Services			Other			Eliminations			Total
	(Millions)
2014
Segment revenues:
Service revenues
External	$	3,106		$	781	$	—		$	229		$	—		$	4,116
Internal	1			—		—			30			(31		)	—
Total service revenues	3,107			781		—			259			(31		)	4,116
Product sales
External	3,521			—		—			—			—			3,521
Internal	—			—		—			—			—			—
Total product sales	3,521			—		—			—			—			3,521
Total revenues	$	6,628		$	781	$	—		$	259		$	(31	)	$	7,637
Segment profit (loss)	$	1,743		$	2,803	$	(115	)	$	4					$	4,435
Less:
Equity earnings (losses)	132			90		(78		)	—						144
Gain on remeasurement of equity-method investment	—			2,544		—			—						2,544
Income (loss) from investments	—			1		(1		)	—						—
Segment operating income (loss)	$	1,611		$	168	$	(36	)	$	4					1,747
General corporate expenses															(178		)
Operating income (loss)															$	1,569
Other financial information:
Additions to long-lived assets (1)	$	3,449		$	16,964	$	291		$	54		$	(2	)	$	20,756
Depreciation and amortization	855			296		—			25						1,176
__________________
(1) 2014 Additions to long-lived assets within our Access Midstream segment primarily includes the acquisition-date fair value of long-lived assets from the ACMP Acquisition (see Note 2 - Acquisitions).
2013
Segment revenues:
Service revenues
External	$	2,914		$	—	$	—		$	25		$	—		$	2,939
Internal	—			—		—			11			(11		)	—
Total service revenues	2,914			—		—			36			(11		)	2,939
Product sales
External	3,921			—		—			—			—			3,921
Internal	—			—		—			—			—			—
Total product sales	3,921			—		—			—			—			3,921
Total revenues	$	6,835		$	—	$	—		$	36		$	(11	)	$	6,860
Segment profit (loss)	$	1,677		$	61	$	(32	)	$	(5	)				$	1,701
Less:
Equity earnings (losses)	104			30		—			—						134
Income (loss) from investments	(3		)	31		—			—						28
Segment operating income (loss)	$	1,576		$	—	$	(32	)	$	(5	)				1,539
General corporate expenses															(164		)
Operating income (loss)															$	1,375
Other financial information:
Additions to long-lived assets	$	3,409		$	—	$	295		$	27					$	3,731
Depreciation and amortization	791			—		—			24						815

	Williams Partners			Access Midstream		Williams NGL & Petchem Services			Other		Eliminations			Total
	(Millions)
2012
Segment revenues:
Service revenues
External	$	2,714		$	—	$	—		$	15	$	—		$	2,729
Internal	—			—		—			12		(12		)	—
Total service revenues	2,714			—		—			27		(12		)	2,729
Product sales
External	4,757			—		—			—		—			4,757
Internal	—			—		—			—		—			—
Total product sales	4,757			—		—			—		—			4,757
Total revenues	$	7,471		$	—	$	—		$	27	$	(12	)	$	7,486
Segment profit (loss)	$	1,907		$	—	$	(3	)	$	56				$	1,960
Less:
Equity earnings (losses)	111			—		—			—					111
Income (loss) from investments	(4		)	—		—			53					49
Segment operating income (loss)	$	1,800		$	—	$	(3	)	$	3				1,800
General corporate expenses														(188		)
Operating income (loss)														$	1,612
Other financial information:
Additions to long-lived assets	$	5,851		$	—	$	136		$	31				$	6,018
Depreciation and amortization	734			—		—			22					756

Total assets and equity method investments by reporting segment [Table Text Block]

The following table reflects Total assets and Equity-method investments by reportable segments:

	Total Assets						Equity-Method Investments
	December 31, 2014			December 31, 2013			December 31, 2014		December 31, 2013
	(Millions)
Williams Partners	$	26,298		$	23,571		$	2,395	$	2,187
Access Midstream	23,024			2,161			6,004		2,161
Williams NGL & Petchem Services	612			486			—		12
Other	1,220			1,359			1		—
Eliminations	(591		)	(435		)	—		—
Total	$	50,563		$	27,142		$	8,400	$	4,360