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Related Party Transactions - NPC (Details) - NPC - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Nov. 30, 2022
Related Party Transaction [Line Items]        
Notes receivable - affiliate $ 100,000,000 $ 0    
BHE        
Related Party Transaction [Line Items]        
SG&A expenses from transactions with related party 46,000,000 30,000,000 $ 6,000,000  
Kern River        
Related Party Transaction [Line Items]        
Related party expense 49,000,000 52,000,000 52,000,000  
Due to affiliate 3,000,000 4,000,000    
SPPC        
Related Party Transaction [Line Items]        
SG&A expenses from transactions with related party 16,000,000 15,000,000 15,000,000  
Due to affiliate 0 0    
Receivables from affiliates 33,000,000 2,000,000    
Expense reimbursement 25,000,000 25,000,000 26,000,000  
NV Energy        
Related Party Transaction [Line Items]        
SG&A expenses from transactions with related party 9,000,000 9,000,000 9,000,000  
Due to affiliate 51,000,000 33,000,000    
Receivables from affiliates 0 0    
Expense reimbursement 3,000,000 1,000,000 0  
Notes receivable - affiliate 100,000,000     $ 100,000,000
Income tax receivable (payable), related parties current 12,000,000 27,000,000    
Related party, cash received (paid) income taxes 29,000,000 (63,000,000) (50,000,000)  
Distribution | PAC        
Related Party Transaction [Line Items]        
Due to affiliate 0 0    
Related party revenue 4,000,000 3,000,000 3,000,000  
Receivables from affiliates 0 0    
Purchases from related party 0 0 1,000,000  
Distribution | SPPC        
Related Party Transaction [Line Items]        
Due to affiliate 5,000,000 0    
Related party revenue 362,000,000 179,000,000 106,000,000  
Receivables from affiliates 41,000,000 13,000,000    
Purchases from related party $ 86,000,000 $ 43,000,000 $ 34,000,000