Segment Disclosures (Tables)

12 Months Ended

Dec. 31, 2012

Segment Disclosures [Abstract]

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

		United States		Other		Total
		(Millions)
Revenues from external customers:
	2012	$	7,335	$	151	$	7,486
	2011		7,728		202		7,930
	2010		6,471		167		6,638
Long-lived assets:
	2012	$	16,940	$	880	$	17,820
	2011		12,041		583		12,624
	2010		11,384		408		11,792

Reconciliation of segment revenues and segment profit (loss)

					Williams		Access
			Williams		NGL & Petchem		Midstream
			Partners		Services		Partners		Other		Eliminations		Total
			(Millions)
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
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
2010
Segment revenues:
	Service revenues
		External	$	2,346	$	1	$	-	$	12	$	-	$	2,359
		Internal		-		-		-		12		(12)		-
	Total service revenues			2,346		1		-		24		(12)		2,359
	Product sales
		External		4,113		166		-		-		-		4,279
		Internal		-		71		-		-		(71)		-
	Total product sales			4,113		237		-		-		(71)		4,279
Total revenues			$	6,459	$	238	$	-	$	24	$	(83)	$	6,638
Segment profit (loss)			$	1,666	$	80	$	-	$	68	$	-	$	1,814
Less:
		Equity earnings (losses)		109		-		-		34		-		143
		Income (loss) from investments		-		-		-		43		-		43
Segment operating income (loss)			$	1,557	$	80	$	-	$	(9)	$	-		1,628
General corporate expenses														(221)
Operating income (loss)													$	1,407
Other financial information:
		Additions to long-lived assets	$	911	$	97	$	-	$	25	$	-	$	1,033
		Depreciation and amortization	$	578	$	13	$	-	$	21	$	-	$	612

Total assets and equity method investments by reporting segment

			Total Assets				Equity Method Investments
		December 31, 2012		December 31, 2011		December 31, 2012		December 31, 2011		December 31, 2010
			(Millions)
Williams Partners (a)		$	19,709	$	14,672	$	1,800	$	1,383	$	1,045
Williams NGL & Petchem Services			1,134		837		-		-		-
Access Midstream Partners (a)			2,187		-		2,187		-		-
Other			1,782		1,275		-		7		193
Eliminations			(485)		(282)		-		-		-
Discontinued operations (see Note 3)			-		-		-		-		104
	Total	$	24,327	$	16,502	$	3,987	$	1,390	$	1,342

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