Decommissioning Trust Funds (Tables)

6 Months Ended

Jun. 30, 2011

Decommissioning Trust Funds (Tables) [Abstract]


			Total		Total
	Fair		Unrealized		Unrealized
	Value		Gains		Losses
	(In Millions)
2011
Equity Securities	$	2,204	$	525	$	5
Debt Securities		1,571		75		5

Total	$	3,775	$	600	$	10


2010
Equity Securities	$	2,076	$	436	$	9
Debt Securities		1,520		67		12

Total	$	3,596	$	503	$	21

Available for sale Securities Continuous Unrealized Loss Position Fair Value

The fair value and gross unrealized losses of available-for-sale equity and debt securities, summarized by investment type and length of time that the securities have been in a continuous loss position, are as follows as of June 30, 2011:


	Equity Securities				Debt Securities
			Gross				Gross
	Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses
	(In Millions)
Less than 12 months	$	49	$	1	$	314	$	5
More than 12 months		52		4		5		—

Total	$	101	$	5	$	319	$	5


	Equity Securities				Debt Securities
			Gross				Gross
	Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses
	(In Millions)
Less than 12 months	$	15	$	1	$	474	$	11
More than 12 months		105		8		4		1

Total	$	120	$	9	$	478	$	12

Fair value of debt securities by contractual maturities


	2011		2010
	(In Millions)
Less than 1 year	$	51	$	37
1 year - 5 years		564		557
5 years - 10 years		548		512
10 years - 15 years		161		163
15 years - 20 years		46		47
20 years+		201		204

Total	$	1,571	$	1,520

- Definition

This item represents the entire disclosure related to Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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