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Business Combinations and Settlement of Preexisting Relationships (Details) $ in Millions	12 Months Ended
	Sep. 30, 2016 USD ($) Companies	Jul. 20, 2016 USD ($)
Business Combinations and Settlement of Preexisting Relationships [Abstract]
Percentage equity interests acquired		100.00%
Number of SPE's acquired | Companies	2
Number of combustion turbine units - SPEs		4
Number of combustion units - Lease/leaseback		8
Total cash consideration	$ 33
Fair value of assets acquired		$ 111
Fair value of liabilities assumed		78
Amortization expense of SPE's acquired	1
Loss on extinguishment	$ 6
Lease/leaseback obligations settled		72
Reacquisition price		$ 78

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Business Combinations and Settlement of Preexisting Relationships [Abstract]

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Carrying value of lease/leaseback obligations settled

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Number of combustion turbine units - SPEs

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Reacquisition price of lease/leaseback obligations

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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Amount of assets acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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-Publisher FASB
-Name Accounting Standards Codification
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The net gains or losses recognized for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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The number of businesses acquired by the entity during the period.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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