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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 17 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) Customer | Jun. 30, 2019 | Jun. 30, 2020 USD ($) Customer | Jun. 30, 2019 | Jun. 30, 2020 USD ($) Customer | Jan. 29, 2019 USD ($)
Customer Concentration Risk |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Number of customers representing ten percent or more of revenue | Customer |  |  | 0 |  |  |
Number of customers representing ten percent or more of net receivable position | Customer | 0 |  | 0 |  | 0 |
PG&E |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Receivables sold | $ 36 |  |  |  |  |
Cash received from sale of receivables | $ 34 |  |  |  |  |
PG&E | Pre-Petition Receivables |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Accounts receivable |  |  | $ 1 |  | $ 1 | $ 165
Proceeds from collection of pre-petition receivables |  |  |  |  | $ 128 |
Revenue Benchmark [Member] | Customer Concentration Risk |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Concentration risk percentage |  | 13.30% |  | 11.50% |  |

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