Decommissioning Trust Funds (Tables)

9 Months Ended

Sep. 30, 2011

Decommissioning Trust Fund [Abstract]

Securities held

			Total		Total
	Fair		Unrealized		Unrealized
	Value		Gains		Losses
			(In Millions)
2011
Equity Securities	$	1,930	$	277	$	40
Debt Securities		1,636		115		5
Total	$	3,566	$	392	$	45
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 September 30, 2011:

	Equity Securities				Debt Securities
			Gross				Gross
	Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses
			(In Millions)
Less than 12 months	$	393	$	30	$	166	$	3
More than 12 months		39		10		54		2
Total	$	432	$	40	$	220	$	5

     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 December 31, 2010:

	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	$	49	$	37
1 year - 5 years		553		557
5 years - 10 years		603		512
10 years - 15 years		183		163
15 years - 20 years		47		47
20 years+		201		204
Total	$	1,636	$	1,520