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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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- Definition

Number Of Customers Representing Ten Percent Or More Of Net Receivable Position

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Number of customers representing 10% or more of revenues

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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