Fair Value (Details Textuals) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Fair Value (Textuals) [Abstract]
Average maturity of debt securities (in years) (approximately)	8 years		8 years		6 years
Impairment of investments	$ 62	$ 138	$ 73	$ 83
Realized losses reclassified out of other comprehensive income	0	0
Gains (Losses) related to trading securities	4	(2)	4	(2)
Other Investments	109		109		111
Transfer out of Level 3	2	(138)	24	(86)
Significant transfer of assets between level 1 and 2			0	0
Unrealized losses for Trust Assets	0	0	0	0
Electricity [Member]
Fair Value (Textuals) [Abstract]
Transfer out of Level 3	$ 2	$ (138)	$ 25	$ (83)

Average maturity of debt securities.

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- Definition

Fair Value Level 1 To Level 2 Transfers Amount.

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- Definition

Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

+ Details

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- Definition

Fair Value.

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- Definition

Unrealized Losses For Trust Assets

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- Definition

This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph a

+ Details

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- Definition

This element represents the amount by which the carrying amount exceeds the fair value of the investment. The amount is charged to income if the decline in fair value is deemed to be other than temporary.

+ References

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

+ Details

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- Definition

Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, after tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 18, 19

+ Details

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- Definition

For trading securities held as of the balance sheet date, this amount represents the difference between the fair value of trading securities and their carrying value (unrealized holding gain or loss). Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and such unrealized holding gain or loss is included in earnings for the period.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph a

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
-Subparagraph e

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