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Acquisitions, Discontinued Operations and Dispositions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Aug. 01, 2019
Jun. 01, 2018
Business Acquisition [Line Items]        
Goodwill $ 579 $ 579    
Stream Energy        
Business Acquisition [Line Items]        
Account receivable     $ 98  
Accounts payable     (73)  
Other net current and non-current working capital     5  
Goodwill     6  
Direct Energy Purchase Price     329  
Stream Energy | Texas        
Business Acquisition [Line Items]        
Goodwill     5  
Stream Energy | East        
Business Acquisition [Line Items]        
Goodwill     1  
Stream Energy | Marketing Partnerships        
Business Acquisition [Line Items]        
Other intangible assets     154  
Stream Energy | Customer Relationships        
Business Acquisition [Line Items]        
Other intangible assets     85  
Stream Energy | Trade Names        
Business Acquisition [Line Items]        
Other intangible assets     28  
Stream Energy | Other Intangible Assets        
Business Acquisition [Line Items]        
Other intangible assets     $ 26  
XOOM Energy, LLC        
Business Acquisition [Line Items]        
Other net current and non-current working capital       $ 46
Other intangible assets       133
Goodwill       34
Direct Energy Purchase Price       213
XOOM Energy, LLC | Texas        
Business Acquisition [Line Items]        
Goodwill       28
XOOM Energy, LLC | East        
Business Acquisition [Line Items]        
Goodwill       $ 6