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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 Customer | Sep. 30, 2019 Customer | Sep. 30, 2020 Customer | Sep. 30, 2019 | Dec. 31, 2019 Customer | Jan. 29, 2019 USD ($)
Customer Concentration Risk |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Number of customers representing ten percent or more of revenue | 0 | 0 | 0 |  |  |
Number of customers representing ten percent or more of net receivable position | 0 |  | 0 |  | 0 |
PG&E | Pre-Petition Receivables |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Accounts receivable | $ |  |  |  |  |  | $ (165)
Revenue Benchmark | Customer Concentration Risk |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Concentration risk percentage |  |  |  | 10.50% |  |

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