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Commitments and Contingencies Commitments and Contingencies - Table (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Obligations    
Time period shown for contractual commitments 5 years  
2015 $ 1,064  
2016 65  
2017 1,590  
2018 1,718  
2019 1,070  
Thereafter 18,829  
Total 24,336  
Total 18 13
2015 100  
2016 100  
2017 100  
2018 100  
2019 10  
Thereafter 0  
Total 410  
Foreign currency exchange loss 44 43
Net discount on sale of Bonds 89  
Debt
    
Obligations    
2015 1,628  
2016 32  
2017 1,555  
2018 1,682  
2019 1,032  
Thereafter 17,692  
Total 23,621 [1]  
Debt of VIEs
    
Obligations    
2015 32  
2016 33  
2017 35  
2018 36  
2019 38  
Thereafter 1,137  
Total 1,311  
Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain]
    
Obligations    
2015 2  
2016 2  
2017 2  
2018 2  
2019 2  
Thereafter 29  
Total 39  
Lease Obligations - Capital
    
Obligations    
2015 13  
2016 13  
2017 13  
2018 13  
2019 12  
Thereafter 167  
Total 231  
Lease Obligations - Non-Cancelable Operating
    
Obligations    
2015 38  
2016 36  
2017 34  
2018 27  
2019 25  
Thereafter 63  
Total 223  
Purchase Obligations - Power
    
Obligations    
2015 220  
2016 222  
2017 232  
2018 235  
2019 239  
Thereafter 3,364  
Total 4,512  
Purchase Obligations - Fuel
    
Obligations    
2015 1,335  
2016 862  
2017 477  
2018 552  
2019 492  
Thereafter 1,579  
Total 5,297  
Purchase Obligations - Other
    
Obligations    
2015 304  
2016 215  
2017 202  
2018 199  
2019 192  
Thereafter 1,640  
Total 2,752  
Unfunded Loan Commitment [Member]
    
Obligations    
2015 13  
Total 13  
Payments on Other Financings
    
Obligations    
2015 104  
2016 104  
2017 104  
2018 104  
2019 96  
Thereafter 305  
Total 817  
Total
    
Obligations    
2015 3,689  
2016 1,519  
2017 2,654  
2018 2,850  
2019 2,128  
Thereafter 25,976  
Total $ 38,816  
[1] Does not include noncash items of foreign currency exchange loss of $44 million and net discount on sale of Bonds of $89 million.