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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 Customer | Dec. 31, 2019 Customer | Dec. 31, 2018 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 |  |
PG&E | Pre-Petition Receivables |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Accounts receivable | $ |  |  |  | $ 165

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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