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Acquisitions, Discontinued Operations and Dispositions - Acquisitions (Details)
customer in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Jan. 05, 2021
USD ($)
state
customer
province
Sep. 29, 2020
USD ($)
Aug. 01, 2019
USD ($)
state
customer
Jun. 01, 2018
USD ($)
customer
state
Dec. 31, 2020
USD ($)
customer
Dec. 31, 2020
USD ($)
customer
Dec. 31, 2019
USD ($)
customer
Dec. 31, 2018
USD ($)
customer
Business Acquisition [Line Items]                
Number of states in which the entity operates | state     9          
Acquisition costs           $ 17    
Operating lease liability         $ 347 347    
Leased Assets, Powerton facility and Units 7 and 8 of the Joliet facility                
Business Acquisition [Line Items]                
Lease expense             $ 14  
Operating lease liability   $ 148            
Powerton Facility And Units 7 And 8 Of The Joliet Facility                
Business Acquisition [Line Items]                
Payment for asset acquisition   $ 260            
Direct Energy                
Business Acquisition [Line Items]                
Proceeds from issuance of long-term debt         $ 2,900      
Stream Energy                
Business Acquisition [Line Items]                
Cash paid to acquire business     $ 329          
Working capital adjustments     $ 29          
Residential customer equivalents acquired | customer     600          
Customers acquired | customer     450          
XOOM Energy, LLC                
Business Acquisition [Line Items]                
Number of states in which the entity operates | state       19        
Purchase price       $ 213        
Working capital adjustments       $ 48        
Residential customer equivalents acquired | customer       395        
Customers acquired | customer       300        
Small Book Acquisitions 2020                
Business Acquisition [Line Items]                
Purchase price           $ 22    
Customers acquired | customer         56 56    
Small Book Acquisitions 2019                
Business Acquisition [Line Items]                
Purchase price             17  
Cash paid to acquire business             $ 13  
Customers acquired | customer             72  
Small Book Acquisitions 2018                
Business Acquisition [Line Items]                
Purchase price               $ 44
Cash paid to acquire business             $ 2 $ 40
Customers acquired | customer               115
Subsequent Event                
Business Acquisition [Line Items]                
Customers added (over) | customer 6,000              
Subsequent Event | Direct Energy                
Business Acquisition [Line Items]                
Customers added (over) | customer 3,000              
Purchase price $ 3,625              
Purchase price adjustment 77              
Cash paid to acquire business 715              
Proceeds from revolving Credit Facility 166              
Acquisition costs $ 107              
Subsequent Event | Direct Energy | U.S.                
Business Acquisition [Line Items]                
Number of states in which the entity operates | state 50              
Subsequent Event | Direct Energy | Canada                
Business Acquisition [Line Items]                
Provinces in which entity operates | province 8