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Fair Value And Unrealized Gains For Nuclear Decommissioning Trust Funds.

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Fair value of nuclear decommissioning trust fund assets.

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Gains And Losses And Proceeds From The Sale Of Securities.

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Impairment charges for unrealized losses recognized as regulatory assets.

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For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income, a separate component of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 137

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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For an unclassified balance sheet, this item represents equity securities categorized neither as held-to-maturity nor trading. Equity securities represent ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is not mandatorily redeemable or redeemable at the option of the holder), convertible securities, stock rights, or stock warrants. Unrealized gains and losses related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 86-40

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3
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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
-Subparagraph a

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Estimated fair value of the debt instrument at the balance-sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10

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Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 12
-Article 5

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
-Subparagraph a

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Publisher FASB
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
-Subparagraph b

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Fair Value (Details 2) (USD $)	3 Months Ended		6 Months Ended
Fair Value (Details 2) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Fair value of long-term debt securities
Long-Term Debt, Fair value	$ 8,400,000,000		$ 8,400,000,000		$ 8,500,000,000
Long-Term Debt, Carrying value	7,800,000,000		7,800,000,000		8,000,000,000
Fair value of nuclear decommissioning trust fund assets
Nuclear decommissioning trust funds	975,000,000		975,000,000		939,000,000
Fair value and unrealized gains for the nuclear decommissioning trust funds
Nuclear decommissioning trust funds	975,000,000		975,000,000		939,000,000
Gains and losses and proceeds from the sale of securities
Realized gains	12,000,000	12,000,000	26,000,000	21,000,000
Realized losses	(9,000,000)	(11,000,000)	(17,000,000)	(19,000,000)
Proceeds from sales of securities	39,000,000	69,000,000	59,000,000	128,000,000
Carrying Value [Member]
Available-for-sale debt and equity securities
Available for sale securities cash equivalents	129,000,000		129,000,000		133,000,000
Available for Sale Securities Equity Securities	6,000,000		6,000,000		6,000,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair value of nuclear decommissioning trust fund assets
Nuclear decommissioning trust funds	975,000,000		975,000,000		939,000,000
Fair value and unrealized gains for the nuclear decommissioning trust funds
Equity securities	589,000,000		589,000,000		572,000,000
Debt securities	381,000,000		381,000,000		361,000,000
Cash and cash equivalents	5,000,000		5,000,000		6,000,000
Nuclear decommissioning trust funds	975,000,000		975,000,000		939,000,000
Available-for-sale debt and equity securities
Available for sale securities cash equivalents	129,000,000		129,000,000		133,000,000
Available for Sale Securities Equity Securities	6,000,000		6,000,000		6,000,000
Estimate of Fair Value, Fair Value Disclosure [Member] \| Fermi 2 [Member]
Fair value of nuclear decommissioning trust fund assets
Nuclear decommissioning trust funds	942,000,000		942,000,000		910,000,000
Fair value and unrealized gains for the nuclear decommissioning trust funds
Nuclear decommissioning trust funds	942,000,000		942,000,000		910,000,000
Estimate of Fair Value, Fair Value Disclosure [Member] \| Fermi 1 [Member]
Fair value of nuclear decommissioning trust fund assets
Nuclear decommissioning trust funds	3,000,000		3,000,000		3,000,000
Fair value and unrealized gains for the nuclear decommissioning trust funds
Nuclear decommissioning trust funds	3,000,000		3,000,000		3,000,000
Estimate of Fair Value, Fair Value Disclosure [Member] \| Low Level Radioactive Waste [Member]
Fair value of nuclear decommissioning trust fund assets
Nuclear decommissioning trust funds	30,000,000		30,000,000		26,000,000
Fair value and unrealized gains for the nuclear decommissioning trust funds
Nuclear decommissioning trust funds	30,000,000		30,000,000		26,000,000
Unrealized Gain [Member]
Fair value of nuclear decommissioning trust fund assets
Nuclear decommissioning trust funds	114,000,000		114,000,000		88,000,000
Fair value and unrealized gains for the nuclear decommissioning trust funds
Equity securities	100,000,000		100,000,000		77,000,000
Debt securities	14,000,000		14,000,000		11,000,000
Cash and cash equivalents	0		0		0
Nuclear decommissioning trust funds	114,000,000		114,000,000		88,000,000
Fermi 2 [Member]
Available-for-sale debt and equity securities
Impairment charges for unrealized losses recognized as regulatory assets	$ 32,000,000		$ 32,000,000		$ 26,000,000