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Commitments and Contingencies - Table (Details) $ in Millions | Sep. 30, 2020 USD ($) megawatts | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
--- | --- | --- | ---
Obligations |  |  |  |
Megawatts provided under transmission obligations | megawatts |  | 1,450 |  |
Accrual for Environmental Loss Contingencies, Gross |  | $ 14 | $ 15 |
Estimated future decommissioning cost | [1] | 6,785 | 5,616 | $ 4,779
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | 66 | 76 |
Operating Leases, Future Minimum Payments, Due in Two Years |  | 51 | 75 |
Operating Leases, Future Minimum Payments, Due in Three Years |  | 39 | 60 |
Operating Leases, Future Minimum Payments, Due in Four Years |  | 37 | 12 |
Operating Leases, Future Minimum Payments, Due in Five Years |  | 34 | 3 |
Operating Leases, Future Minimum Payments, Due Thereafter |  | 16 | 2 |
Total |  | 243 | 228 |
CT and QTE outstanding leaseback obligation |  | 223 | 263 |
Other Commitment, to be Paid, Year One |  | 207 |  |
Other Commitment, to be Paid, Year Two |  | 25 |  |
Other Commitment, to be Paid, Year Three |  | 0 |  |
Other Commitment, to be Paid, Year Four |  | 0 |  |
Other Commitment, to be Paid, Year Five |  | 0 |  |
Other Commitment, to be Paid, after Year Five |  | 0 |  |
Total |  | 232 |  |
Nuclear |  |  |  |
Obligations |  |  |  |
Estimated future decommissioning cost |  | $ 3,278 | $ 3,136 | $ 2,989
[1] | (1) Includes $345 million a nd $163 million at September 30, 2020 and 2019, respectively, in Current liabilities.

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