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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%