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Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013
Restructuring and Related Activities [Abstract]
Expected increase (decrease) in operation and maintenance expense		$ 500
Severance cost liability	46	46	32	0
Liabilities incurred during the period	21	56
Actual costs paid during the period	$ (7)	$ (10)

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- Definition

The expected increase (decrease) in operation and maintenance expense.

+ References

No definition available.

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869



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-Subparagraph (SAB TOPIC 5.P.3)

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-Name Staff Accounting Bulletin (SAB)

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

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-Section S99

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-Subparagraph (SAB TOPIC 5.P.4(b))

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