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Regulatory Matters - NPC - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 21, 2025
Jan. 31, 2025
Dec. 31, 2023
Aug. 31, 2023
Jun. 30, 2023
Dec. 31, 2024
Public Utilities, General Disclosures [Line Items]            
Regulatory assets not earning a return on investment     $ 3,200     $ 2,100
NPC            
Public Utilities, General Disclosures [Line Items]            
Regulatory assets not earning a return on investment     299     $ 313
NPC | PUNC            
Public Utilities, General Disclosures [Line Items]            
Requested rate increase (decrease)         $ 93  
Requested rate increase (decrease), percentage         3.30%  
Requested rate increase, amended       $ 96    
Requested rate increase, amended, percentage       3.30%    
Approved rate increase (decrease)     $ 37      
NPC | PUNC | Subsequent event            
Public Utilities, General Disclosures [Line Items]            
Requested rate increase (decrease) $ 215          
Requested rate increase (decrease), percentage 9.00%          
Requested self insurance policy, amount   $ 500        
Requested self insurance policy, period   10 years