Average Maturity of Debt Securities

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- Definition

Nuclear Decommissioning Trust Fund Investments

+ References

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- Definition

Transfers Between Levels 1, 2 and 3

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

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- Definition

This item represents the gain (loss) realized during the period from the sale of trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph c

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(c))

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (e)

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Fair Value (Details Textuals) (USD $)	12 Months Ended
Fair Value (Details Textuals) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]
Transfers between levels 1, 2, and 3	$ 0	$ 0
Unrealized Losses on Available for Sale Securities	2,000,000	2,000,000
Trading securities realized gain (loss)	12,000,000	19,000,000	9,000,000
Net Unrealized Gain/(Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Unrealized Losses on Available for Sale Securities	0	0
Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Nuclear decommissioning trust fund investments	61.00%	61.00%
Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Nuclear decommissioning trust fund investments	38.00%	37.00%
Cash and Cash Equivalents [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Nuclear decommissioning trust fund investments	1.00%	2.00%
Recurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	104,000,000	116,000,000
Restricted Assets [Member] \| Recurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	96,000,000	100,000,000
Other Investments [Member] \| Recurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	8,000,000	16,000,000
Other Investments [Member] \| Recurring [Member] \| Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale securities	8,000,000	7,000,000
Nuclear Decommissioning Trust Fund [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	$ 11,000,000	$ 19,000,000
Average maturity of debt securities	7 years	7 years