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ORGANIZATION AND BASIS OF PRESENTATION - Regulatory Assets on the Balance Sheet (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Regulatory assets on the Balance Sheets    
Regulatory Liability $ (2,124) $ (1,826)
Regulatory Assets 71 82
Net Regulatory Liabilities included on the Consolidated Balance Sheets (2,053) (1,744)
Change (309)  
Current Return 732 789
Change (57)  
Customer payables for future income taxes    
Regulatory assets on the Balance Sheets    
Regulatory Liability (2,345) (2,369)
Change 24  
Spent nuclear fuel disposal costs    
Regulatory assets on the Balance Sheets    
Regulatory Liability (101) (102)
Change 1  
Asset removal costs    
Regulatory assets on the Balance Sheets    
Regulatory Liability (646) (721)
Change 75  
Deferred transmission costs    
Regulatory assets on the Balance Sheets    
Regulatory Assets (3) 319
Change (322)  
Current Return 13 17
Change (4)  
Deferred generation costs    
Regulatory assets on the Balance Sheets    
Regulatory Assets 118 17
Change 101  
Current Return 50 5
Change 45  
Deferred distribution costs    
Regulatory assets on the Balance Sheets    
Regulatory Assets 49 79
Change (30)  
Contract valuations    
Regulatory assets on the Balance Sheets    
Regulatory Assets 7 41
Change (34)  
Storm-related costs    
Regulatory assets on the Balance Sheets    
Regulatory Assets 660 748
Change (88)  
Current Return 549 654
Change (105)  
Uncollectible and COVID-19 related costs    
Regulatory assets on the Balance Sheets    
Regulatory Assets 56 97
Change (41)  
Current Return 65 66
Change (1)  
Energy efficiency program costs    
Regulatory assets on the Balance Sheets    
Regulatory Assets 47 42
Change 5  
New Jersey societal benefit costs    
Regulatory assets on the Balance Sheets    
Regulatory Assets 109 112
Change (3)  
Regulatory transition costs    
Regulatory assets on the Balance Sheets    
Regulatory Liability (18) (20)
Change 2  
Current Return 13 16
Change (3)  
Vegetation management    
Regulatory assets on the Balance Sheets    
Regulatory Assets 33 22
Change 11  
Current Return 31 22
Change 9  
Other    
Regulatory assets on the Balance Sheets    
Regulatory Liability (19) (9)
Change (10)  
Current Return 11 $ 9
Change $ 2