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Debt and Other Obligations Debt and Other Obligations - General (Details) $ in Millions	12 Months Ended
	Sep. 30, 2015 USD ($) Types_of_bonds tests	Sep. 30, 2014 USD ($)
Debt Instrument
Other Long-term Debt	$ 1,407	$ 1,425
Debt ceiling	$ 30,000
Number of types of bonds outstanding | Types_of_bonds	2
Power bonds years to maturity - low end of range	1 year
Power bonds years to maturity - high end of range	50 years
Discount notes years to maturity - high end of range	1 year
Number of bond tests | tests	2
Time period for meeting the bondholder protection test	5 years

X

- Definition

The cap on the amount of bonds the company can have outstanding.

+ References

No definition available.

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X

- Definition

Discount notes years to maturity - high end of range

+ References

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- Definition

Number of bond tests: the rate test and the bondholder protection test

+ References

No definition available.

+ Details

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X

- Definition

The number of types of bonds outstanding.

+ References

No definition available.

+ Details

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- Definition

Power bonds years to maturity - high end of range

+ References

No definition available.

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- Definition

Power bonds years to maturity - low end of range

+ References

No definition available.

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- Definition

Time period for meeting the bondholder protection test

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.22)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 19, 20, 22



-Article 5

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