Segment Disclosures (Tables)

12 Months Ended

Dec. 31, 2010

Segment Disclosures (Tables) [Abstract]

Revenues from external customers based on product shipment origin and long-lived assets based upon physical location

	United States		Other		Total
	(Millions)
Revenues from external customers:
2010	$	9,343	$	257	$	9,600
2009		8,048		190		8,238
2008		11,590		261		11,851
Long-lived assets:
2010	$	19,740	$	527	$	20,267
2009		19,185		410		19,595
2008		18,348		335		18,683

Reconciliation of segment revenues and segment profit (loss)

						Midstream
	Williams		Exploration &			Canada &
	Partners		Production			Olefins		Other			Eliminations			Total
	(Millions)
2010
Segment revenues:
External	$	5,344	$	3,229		$	1,017	$	10		$	—		$	9,600
Internal		371		797			16		14			(1,198	)		—
Total revenues	$	5,715	$	4,026		$	1,033	$	24		$	(1,198	)	$	9,600
Segment profit (loss)	$	1,574	$	(1,335	)	$	172	$	68		$	—		$	479
Less:
Equity earnings (losses)		109		20			—		34			—			163
Income (loss) from investments		—		—			—		43			—			43
Segment operating income (loss)	$	1,465	$	(1,355	)	$	172	$	(9	)	$	—			273
General corporate expenses															(221	)
Total operating income (loss)														$	52
Other financial information:
Additions to long-lived assets*	$	904	$	2,857		$	104	$	25		$	—		$	3,890
Depreciation, depletion & amortization	$	568	$	884		$	23	$	21		$	—		$	1,496
2009
Segment revenues:
External	$	4,359	$	3,126		$	738	$	15		$	—		$	8,238
Internal		243		541			15		12			(811	)		—
Total revenues	$	4,602	$	3,667		$	753	$	27		$	(811	)	$	8,238
Segment profit (loss)	$	1,317	$	401		$	37	$	(39	)	$	—		$	1,716
Less:
Equity earnings (losses)		81		18			—		37			—			136
Income (loss) from investments		—		—			—		(75	)		—			(75	)
Segment operating income (loss)	$	1,236	$	383		$	37	$	(1	)	$	—			1,655
General corporate expenses															(164	)
Total operating income (loss)														$	1,491
Other financial information:
Additions to long-lived assets	$	1,023	$	1,302		$	42	$	28		$	—		$	2,395
Depreciation, depletion & amortization	$	553	$	859		$	21	$	19		$	—		$	1,452
2008
Segment revenues:
External	$	5,545	$	5,091		$	1,206	$	9		$	—		$	11,851
Internal		302		1,065			27		15			(1,409	)		—
Total revenues	$	5,847	$	6,156		$	1,233	$	24		$	(1,409	)	$	11,851
Segment profit (loss)	$	1,425	$	1,401		$	112	$	30		$	—		$	2,968
Less:
Equity earnings (losses)		76		20			—		41			—			137
Income (loss) from investments		—		—			1		—			—			1
Segment operating income (loss)	$	1,349	$	1,381		$	111	$	(11	)	$	—			2,830
General corporate expenses															(149	)
Total operating income (loss)														$	2,681
Other financial information:
Additions to long-lived assets	$	1,212	$	2,400		$	23	$	41		$	—		$	3,676
Depreciation, depletion & amortization	$	518	$	702		$	23	$	16		$	—		$	1,259

* Does not include WPZ’s purchase of a business represented by certain gathering and processing assets in Colorado’s Piceance basin from Exploration & Production. (See Note 1.)

Total assets and equity method investments by reporting segment

	Total Assets						Equity Method Investments
	December 31,			December 31,			December 31,		December 31,		December 31,
	2010			2009			2010		2009		2008
	(Millions)
Williams Partners	$	13,404		$	12,479		$	1,045	$	593	$	524
Exploration & Production		9,827			10,084			104		95		87
Midstream Canada & Olefins		922			835			—		—		—
Other		3,481			3,654			193		196		336
Eliminations		(2,662	)		(1,772	)		—		—		—
Total	$	24,972		$	25,280		$	1,342	$	884	$	947