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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Assets and Liabilities Measured On Recurring Basis [Text Block]


Discontinued Operations
	December 31, 2010
	Level 1		Level 2		Level 3		Total

	(Millions)

Energy derivative assets	$	96	$	475	$	2	$	573

Energy derivative liabilities	$	78	$	210	$	1	$	289


Continuing Operations
			December 31, 2011								December 31, 2010
			Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total

			(Millions)
	ARO Trust investments
	(see Note 15)		$	25	$	-	$	-	$	25	$	40	$	-	$	-	$	40
	Available-for-sale equity
		securities (see Note 3)		24		-		-		24		-		-		-		-
	Energy derivatives			1		-		-		1		-		-		-		-
		Total assets	$	50	$	-	$	-	$	50	$	40	$	-	$	-	$	40

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]



	Fair Value		Total
	Measurement		Impairments

	(Millions)
Certain gathering assets – Williams Partners	$	3	$	9

- Definition

Tabular disclosure of assets and liabilities by class, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). The disclosures that may be required or desired include: (a) the fair value measurements recorded during the period and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References+ Details