Segment Disclosures (Tables)

12 Months Ended

Dec. 31, 2013

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:
	2013	$	6,703	$	157	$	6,860
	2012		7,335		151		7,486
	2011		7,728		202		7,930
Long-lived assets:
	2013	$	19,260	$	1,240	$	20,500
	2012		16,940		880		17,820
	2011		12,041		583		12,624

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		Williams NGL & Petchem Services			Access Midstream Partners		Other			Eliminations			Total
	(Millions)
2013
Segment revenues:
Service revenues
External	$	2,910	$	4		$	—	$	25		$	—		$	2,939
Internal	—		—			—		11			(11		)	—
Total service revenues	2,910		4			—		36			(11		)	2,939
Product sales
External	3,775		146			—		—			—			3,921
Internal	—		123			—		—			(123		)	—
Total product sales	3,775		269			—		—			(123		)	3,921
Total revenues	$	6,685	$	273		$	—	$	36		$	(134	)	$	6,860
Segment profit (loss)	$	1,606	$	38		$	61	$	(4	)				$	1,701
Less:
Equity earnings (losses)	104		—			30		—						134
Income (loss) from investments	—		(3		)	31		—						28
Segment operating income (loss)	$	1,502	$	41		$	—	$	(4	)				1,539
General corporate expenses														(164		)
Operating income (loss)														$	1,375
Other financial information:
Additions to long-lived assets	$	3,055	$	649		$	—	$	27		$	—		$	3,731
Depreciation and amortization	758		33			—		24			—			815
2012
Segment revenues:
Service revenues
External	$	2,709	$	5		$	—	$	15		$	—		$	2,729
Internal	—		—			—		12			(12		)	—
Total service revenues	2,709		5			—		27			(12		)	2,729
Product sales
External	4,611		146			—		—			—			4,757
Internal	—		128			—		—			(128		)	—
Total product sales	4,611		274			—		—			(128		)	4,757
Total revenues	$	7,320	$	279		$	—	$	27		$	(140	)	$	7,486
Segment profit (loss)	$	1,812	$	99		$	—	$	49					$	1,960
Less:
Equity earnings (losses)	111		—			—		—						111
Income (loss) from investments	—		(4		)	—		53						49
Segment operating income (loss)	$	1,701	$	103		$	—	$	(4	)				1,800
General corporate expenses														(188		)
Operating income (loss)														$	1,612
Other financial information:
Additions to long-lived assets	$	5,562	$	425		$	—	$	31		$	—		$	6,018
Depreciation and amortization	714		20			—		22			—			756

	Williams Partners		Williams NGL & Petchem Services			Access Midstream Partners		Other		Eliminations			Total
	(Millions)
2011
Segment revenues:
Service revenues
External	$	2,517	$	1		$	—	$	14	$	—		$	2,532
Internal	—		—			—		11		(11		)	—
Total service revenues	2,517		1			—		25		(11		)	2,532
Product sales
External	5,197		201			—		—		—			5,398
Internal	—		139			—		—		(139		)	—
Total product sales	5,197		340			—		—		(139		)	5,398
Total revenues	$	7,714	$	341		$	—	$	25	$	(150	)	$	7,930
Segment profit (loss)	$	2,035	$	157		$	—	$	24				$	2,216
Less:
Equity earnings (losses)	142		—			—		13					155
Income (loss) from investments	—		(4		)	—		11					7
Segment operating income (loss)	$	1,893	$	161		$	—	$	—				2,054
General corporate expenses													(187		)
Operating income (loss)													$	1,867
Other financial information:
Additions to long-lived assets	$	1,273	$	211		$	—	$	46	$	—		$	1,530
Depreciation and amortization	621		16			—		24		—			661

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, 2013			December 31, 2012			December 31, 2013		December 31, 2012
	(Millions)
Williams Partners	$	22,358		$	19,709		$	2,187	$	1,800
Williams NGL & Petchem Services	1,711			1,134			12		—
Access Midstream Partners	2,161			2,187			2,161		2,187
Other	1,625			1,782			—		—
Eliminations	(713		)	(485		)	—		—
Total	$	27,142		$	24,327		$	4,360	$	3,987