FACILITIES UNDER JOINT OWNERSHIP (Tables)

12 Months Ended

Dec. 31, 2012

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	$	351		$	330
Accumulated depreciation and amortization		65			198
Construction work in progress		115			11

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, 2012:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies(1)		$	147	$	9	$	―	$	156
Municipal bonds(2)			57		6		―		63
Other securities(3)			121		10		(1)		130
Total debt securities			325		25		(1)		349
Equity securities			249		292		(2)		539
Cash and cash equivalents			20		―		―		20
Total		$	594	$	317	$	(3)	$	908
As of December 31, 2011:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies		$	157	$	13	$	―	$	170
Municipal bonds			72		5		―		77
Other securities			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
(1)	Maturity dates are 2013-2043.
(2)	Maturity dates are 2013-2111.
(3)	Maturity dates are 2013-2112.

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,
		2012		2011		2010
Proceeds from sales(1)		$	723	$	715	$	351
Gross realized gains			21		75		11
Gross realized losses			(13)		(52)		(11)
(1)	Excludes securities that are held to maturity.

- Definition

Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants 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). Includes 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. States 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 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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