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Acquisitions, Discontinued Operations and Dispositions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Aug. 01, 2019
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill   $ 579 $ 579
Stream Energy Acquisition      
Business Acquisition [Line Items]      
Account receivable $ 98    
Accounts payable (73)    
Other net current and non-current working capital 5    
Goodwill 6    
Stream Purchase Price 329    
Stream Energy Acquisition | Texas      
Business Acquisition [Line Items]      
Goodwill 5    
Stream Energy Acquisition | East      
Business Acquisition [Line Items]      
Goodwill 1    
Stream Energy Acquisition | Marketing Partnerships      
Business Acquisition [Line Items]      
Finite-lived intangibles 154    
Stream Energy Acquisition | Customer Relationships      
Business Acquisition [Line Items]      
Finite-lived intangibles 85    
Stream Energy Acquisition | Trade Names      
Business Acquisition [Line Items]      
Finite-lived intangibles 28    
Stream Energy Acquisition | Other Intangible Assets      
Business Acquisition [Line Items]      
Finite-lived intangibles $ 26