FACILITIES UNDER JOINT OWNERSHIP (Tables)

12 Months Ended

Dec. 31, 2011

Schedule Of Jointly Owned Utility Plants [Abstract]

Schedule of Jointly Owned Utility Plants

				Southwest
(Dollars in millions)	SONGS			Powerlink
Percentage ownership		20	%		91	%
Utility plant in service	$	308		$	323
Accumulated depreciation and amortization		59			191
Construction work in progress		129			22

Schedule Of Nuclear Decommissioning Trusts Investments [Abstract]

Schedule Of Nuclear Decommissioning Trusts Investments

NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
				Gross		Gross		Estimated
				Unrealized		Unrealized		Fair
		Cost		Gains		Losses		Value
As of December 31, 2011:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies(1)		$	157	$	13	$	―	$	170
Municipal bonds(2)			72		5		―		77
Other securities(3)			76		3		(1)		78
Total debt securities			305		21		(1)		325
Equity securities			246		227		(5)		468
Cash and cash equivalents			11		―		―		11
Total		$	562	$	248	$	(6)	$	804

As of December 31, 2010:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies		$	162	$	14	$	(2)	$	174
Municipal bonds			101		2		(3)		100
Other securities			22		3		―		25
Total debt securities			285		19		(5)		299
Equity securities			219		242		(1)		460
Cash and cash equivalents			10		―		―		10
Total		$	514	$	261	$	(6)	$	769
(1)	Maturity dates are 2012-2042
(2)	Maturity dates are 2012-2057
(3)	Maturity dates are 2012-2051

Schedule Of Sales Of Securities By Nuclear Decommissioning Trusts [Abstract]

Schedule Of Sales Of Securities By Nuclear Decommissioning Trusts

SALES OF SECURITIES
(Dollars in millions)
		Years ended December 31,
		2011		2010		2009
Proceeds from sales(1)		$	715	$	351	$	224
Gross realized gains			75		11		6
Gross realized losses			(52)		(11)		(33)
(1)	Excludes securities that are held to maturity.

- Definition

Describes that the entity has a proportionate interest in a jointly owned utility plant. Should include a table showing separately for each interest the amount of plant in service, the accumulated provision for depreciation (if available), the amount of plant under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Should include statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. Should state that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power then should disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants.

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