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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Collateral (Details) $ in Millions	12 Months Ended
	Sep. 30, 2015 USD ($) Customers	Sep. 30, 2014 USD ($) Customers
Derivative
Securities Borrowed, Collateral, Obligation to Return Cash	$ 15	$ 19
Credit of Customers
Derivative
Number of customers that represent the percent of outstanding accounts receivable | Customers	3	3
Collateral
Derivative
Aggregate fair value of derivative instruments with credit-risk related contingent features that were in a liability position	$ 1,700
Collateral obligations	1,100
Collateral already posted	1,100
Likely cash collateral obligation increase if credit is downgraded	$ 22

X

- Definition

The number of customers that represent the percent of outstanding accounts receivable.

+ References

No definition available.

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4H



-Subparagraph (d)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 55



-Paragraph 13



-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313



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



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-Section 50



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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.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4H



-Subparagraph (c)



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- Definition

The increase (decrease) during the reporting period in the amount of cash that is received as security when loaning securities.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



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-Section 45



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- Definition

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against securities borrowed.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



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