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Commitments and Contingencies NSP-Minnesota - MEC Transactions (Details) $ in Millions |  | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 13, 2020 USD ($) | Jun. 30, 2020 MW | Sep. 30, 2020 USD ($) | Jul. 10, 2020 USD ($) | Dec. 31, 2019 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Other Liabilities, Current |  |  | $ 416 |  | $ 468
Liabilities, Current |  |  | 4,393 |  | $ 4,568
Gain on Sale |  |  |  | $ 20 |
MEC Holdings LLC | Unregulated Operation [Member] |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Facility Output | MW |  | 760 |  |  |
PP&E Additions | $ 650 |  |  |  |
MEC Holdings LLC | Unregulated Operation [Member] | Southwest Generation [Domain] |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
PP&E Sale |  |  | $ 684 |  |

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