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Commitments and Contingencies Commitments and Contingencies - Table (Details) $ in Millions | Sep. 30, 2019 USD ($) megawatts | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
--- | --- | --- | ---
Obligations |  |  |  |
Megawatts provided under transmission obligations | megawatts |  | 1,450 |  |
Accrual for Environmental Loss Contingencies, Gross |  | $ 15 | $ 12 |
Estimated future decommissioning cost | [1] | 5,616 | 4,779 | $ 4,304
2018 |  | 53 |  |
2019 |  | 53 |  |
2020 |  | 53 |  |
2021 |  | 55 |  |
2022 |  | 51 |  |
Thereafter |  | 418 |  |
Total |  | 683 |  |
2018 |  | 76 |  |
2019 |  | 75 |  |
2020 |  | 60 |  |
2021 |  | 12 |  |
2022 |  | 3 |  |
Thereafter |  | 2 |  |
Total |  | 228 |  |
CT and QTE outstanding leaseback obligation |  | 263 | $ 301 |
2018 |  | 50 |  |
2019 |  | 207 |  |
2020 |  | 25 |  |
2021 |  | 0 |  |
2022 |  | 0 |  |
Thereafter |  | 0 |  |
Total |  | $ 282 |  |
[1] | (1) The current portions of the ARO liability in the amounts of $163 million and $115 million at September 30, 2019 and 2018, respectively, are included in Accounts payable and accrued liabilities.

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