Investments (Tables)

6 Months Ended

Jun. 30, 2011

Investments

Available-For-Sale Securities

	Amortized Cost		Total  Unrealized Gains(1)		Total Unrealized Losses (1)			Fair Value
(millions)
June 30, 2011
Marketable equity securities
U.S.:
Large Cap	$	1,187	$	597	$	—		$	1,784
Other		41		11		—			52
Marketable debt securities:
Corporate bonds		274		18		(1	)		291
U.S. Treasury securities and agency debentures		499		14		(1	)		512
State and municipal		213		13		(1	)		225
Other		22		—		—			22
Cost method investments		110		—		—			110
Cash equivalents and other(2)		44		—		—			44
Total	$	2,390	$	653	$	(3	)(3)	$	3,040
December 31, 2010
Marketable equity securities:
U.S.:
Large Cap	$	1,161	$	515	$	—		$	1,676
Other		39		11		—			50
Marketable debt securities:
Corporate bonds		310		18		(1	)		327
U.S. Treasury securities and agency debentures		380		12		(1	)		391
State and municipal		244		7		(4	)		247
Other		19		—		—			19
Cost method investments		108		—		—			108
Cash equivalents and other(2)		79		—		—			79
Total	$	2,340	$	563	$	(6	)(3)	$	2,897

(1) Included in AOCI and the decommissioning trust regulatory liability.

(2) Includes pending purchases of securities of $25 million and $43 million at June 30, 2011 and December 31, 2010, respectively.

(3) The fair value of securities in an unrealized loss position was $60 million and $252 million at June 30, 2011 and December 31, 2010, respectively.

Investments Classified by Contractual Maturity Date

	Amount
(millions)
Due in one year or less	$	100
Due after one year through five years		300
Due after five years through ten years		316
Due after ten years		334
Total	$	1,050

Marketable Securities

Three Months Ended June 30,					Six Months Ended June 30,
	2011		2010			2011		2010
(millions)
Proceeds from sales	$	437	$	627		$	939	$	1,140
Realized gains(1)		18		17			32		73
Realized losses(1)		12		28			20		54

(1) Includes realized gains or losses recorded to the decommissioning trust regulatory liability.

Other Than Temporary Impairment Losses on Investment Securities

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011			2010
(millions)
Total other-than-temporary impairment losses(1)	$	10		$	41		$	15		$	48
Losses recorded to decommissioning trust regulatory liability		(4	)		(13	)		(6	)		(16	)
Losses recognized in other comprehensive income (before taxes)		(1	)		(1	)		(1	)		(2	)
Net impairment losses recognized in earnings	$	5		$	27		$	8		$	30

(1) Amount includes other-than-temporary impairment losses for debt securities of $1 million for the three months ended June 30, 2011 and 2010, and $2 million and $3 million for the six months ended June 30, 2011 and 2010, respectively.