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Acquisitions, Discontinued Operations and Dispositions - Schedule of Purchase Price Allocation (Details) - USD ($)
$ in Millions
Aug. 01, 2019
Jun. 01, 2018
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill     $ 591 $ 573
Stream Energy Acquisition        
Business Acquisition [Line Items]        
Net current and non-current working capital $ 28      
Other intangible assets 283      
Goodwill 18      
Purchase price $ 329      
XOOM Energy, LLC        
Business Acquisition [Line Items]        
Net current and non-current working capital   $ 46    
Other intangible assets   133    
Goodwill   34    
Purchase price   $ 213