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v3.20.1

Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Millions | 3 Months Ended | 14 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) Customer | Dec. 31, 2019 USD ($) Customer | Mar. 31, 2019 Customer | Mar. 31, 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 |  | 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 | $ 5 |  |  | $ 5 | $ 165
Proceeds from collection of pre-petition receivables |  |  |  | $ 124 |

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