Asset Sales, Impairments, and Other Accruals (Tables)

12 Months Ended

Dec. 31, 2011

Asset Sales Impairments and Other Accruals [Abstract]

Asset Sales, Impairments and Other Accruals

			Years Ended December 31,
			2011		2010		2009
			(Millions)
Williams Partners
	Capitalization of project feasibility costs previously expensed		$	(10)	$	-	$	-
	Involuntary conversion gains			(3)		(18)		(4)
	Gains on sales of certain assets			-		(12)		(40)
	Accrual of regulatory liability related to overcollection of certain employee
		expenses		9		10		-
	Impairments of certain gathering assets			4		9		-
Midstream Canada & Olefins
	Gulf Liquids litigation contingency accrual reduction (see Note 16)			(19)		-		-