Segment Disclosures (Tables)

6 Months Ended

Jun. 30, 2011

Segment Disclosures [Abstract]

Reconciliation of segment revenues and segment profit (loss)

			Exploration		Midstream
	Williams		&		Canada &
	Partners		Production		Olefins		Other			Eliminations			Total
	(Millions)
Three months ended June 30, 2011
Segment revenues:
External	$	1,557	$	762	$	345	$	5		$	—		$	2,669
Internal		114		219		2		2			(337	)		—
Total revenues	$	1,671	$	981	$	347	$	7		$	(337	)	$	2,669
Segment profit (loss)	$	471	$	94	$	72	$	2		$	—		$	639
Less equity earnings (losses)		36		5		—		4			—			45
Segment operating income (loss)	$	435	$	89	$	72	$	(2	)	$	—			594
General corporate expenses														(47	)
Total operating income (loss)													$	547
Three months ended June 30, 2010
Segment revenues:
External	$	1,307	$	726	$	254	$	2		$	—		$	2,289
Internal		93		175		3		3			(274	)		—
Total revenues	$	1,400	$	901	$	257	$	5		$	(274	)	$	2,289
Segment profit (loss)	$	361	$	73	$	61	$	18		$	—		$	513
Less:
Equity earnings (losses)		27		5		—		7			—			39
Income (loss) from investments		—		—		—		13			—			13
Segment operating income (loss)	$	334	$	68	$	61	$	(2	)	$	—			461
General corporate expenses														(45	)
Total operating income (loss)													$	416
Six months ended June 30, 2011
Segment revenues:
External	$	3,035	$	1,541	$	661	$	7		$	—		$	5,244
Internal		215		429		2		6			(652	)		—
Total revenues	$	3,250	$	1,970	$	663	$	13		$	(652	)	$	5,244
Segment profit (loss)	$	908	$	145	$	146	$	22		$	—		$	1,221
Less:
Equity earnings (losses)		61		11		—		13			—			85
Income (loss) from investments		—		—		—		11			—			11
Segment operating income (loss)	$	847	$	134	$	146	$	(2	)	$	—			1,125
General corporate expenses														(98	)
Total operating income (loss)													$	1,027
Six months ended June 30, 2010
Segment revenues:
External	$	2,704	$	1,651	$	521	$	4		$	—		$	4,880
Internal		186		407		8		7			(608	)		—
Total revenues	$	2,890	$	2,058	$	529	$	11		$	(608	)	$	4,880
Segment profit (loss)	$	785	$	226	$	81	$	25		$	—		$	1,117
Less:
Equity earnings (losses)		53		10		—		16			—			79
Income (loss) from investments		—		—		—		13			—			13
Segment operating income (loss)	$	732	$	216	$	81	$	(4	)	$	—			1,025
General corporate expenses														(130	)
Total operating income (loss)													$	895
June 30, 2011
Total assets (a)	$	13,723	$	9,778	$	1,052	$	1,478		$	(326	)	$	25,705
December 31, 2010
Total assets	$	13,404	$	9,827	$	922	$	3,481		$	(2,662	)	$	24,972

(a) The decrease in Other and Eliminations is substantially due to the forgiveness of an intercompany long-term receivable.