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Commitments and Contingencies Commitments and Contingencies - Table (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2016
USD ($)
Obligations  
Time period shown for contractual commitments 5 years
Membership interest of variable interest entity subject to mandatory redemption  
Obligations  
2017 $ 2
2018 2
2019 2
2020 3
2021 3
Thereafter 23
Total 35
Lease Obligations - Capital  
Obligations  
2017 51 [1]
2018 51 [1]
2019 50 [1]
2020 50 [1]
2021 50 [1]
Thereafter 564 [1]
Total 816 [1]
Lease Obligations - Non-Cancelable Operating  
Obligations  
2017 43 [2]
2018 32 [2]
2019 25 [2]
2020 25 [2]
2021 25 [2]
Thereafter 13 [2]
Total 163 [2]
Purchase Obligations - Power  
Obligations  
2017 254 [3]
2018 265 [3]
2019 266 [3]
2020 246 [3]
2021 244 [3]
Thereafter 1,541 [3]
Total 2,816 [3]
Purchase Obligations - Fuel  
Obligations  
2017 1,312 [4]
2018 917 [4]
2019 569 [4]
2020 324 [4]
2021 327 [4]
Thereafter 1,006 [4]
Total 4,455 [4]
Purchase Obligations - Other  
Obligations  
2017 88 [5]
2018 65 [5]
2019 58 [5]
2020 47 [5]
2021 34 [5]
Thereafter 604 [5]
Total 896 [5]
Unfunded Loan Commitment  
Obligations  
2017 9
2018 4
Total 13
Payments on Other Financings  
Obligations  
2017 76
2018 76
2019 75
2020 73
2021 207
Thereafter 26
Total 533
Total  
Obligations  
2017 1,835
2018 1,412
2019 1,045
2020 768
2021 890
Thereafter 3,777
Total $ 9,727
[1] (1) Includes the interest component of capital leases based on the interest rates stated in the lease agreements and excludes certain related executory costs. Minimum commitments related to executory costs are included in purchase obligations.
[2] (2) Does not include purchased power agreements that are accounted for as operating leases and included in power purchase obligations.
[3] (3) Includes commitments for energy and/or capacity under power purchase agreements from coal-fired, hydroelectric, diesel, and gas-fired facilities, as well as transmission service agreements to support purchases of power from the market and wind power purchase agreements.
[4] (4) Includes commitments to purchase nuclear fuel, coal, and natural gas, as well as related transportation and storage services.
[5] (5) Primarily includes long-term service contracts, contracts that contain minimum purchase levels for the purchase of limestone along with related storage and transportation, and contractual obligations related to load control programs.