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Business Combinations and Settlement of Preexisting Relationships (Details) $ in Millions | 12 Months Ended |
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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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