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Related Party Transactions - NPC (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]      
Related party, cash received (paid) for income taxes $ 1,441,000,000 $ 1,504,000,000 $ 942,000,000
NPC | BHE      
Related Party Transaction [Line Items]      
SG&A expenses from transactions with related party 3,000,000 2,000,000 2,000,000
NPC | Kern River      
Related Party Transaction [Line Items]      
Related party expense 52,000,000 52,000,000 52,000,000
Due to affiliate 4,000,000 4,000,000  
NPC | SPPC      
Related Party Transaction [Line Items]      
SG&A expenses from transactions with related party 15,000,000 15,000,000 14,000,000
Due to affiliate 0 0  
Receivables from affiliates 2,000,000 2,000,000  
Expense reimbursement 25,000,000 26,000,000 26,000,000
NPC | 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 33,000,000 28,000,000  
Receivables from affiliates 0 0  
Expense reimbursement 1,000,000 0 0
Income tax receivable (payable), related parties current 27,000,000 0  
Related party, cash received (paid) for income taxes 63,000,000 50,000,000 113,000,000
NPC | Distribution | PAC      
Related Party Transaction [Line Items]      
Due to affiliate 0 0  
Related party revenue 3,000,000 3,000,000 2,000,000
Receivables from affiliates 0 0  
Purchases from related party 0 1,000,000 0
NPC | Distribution | SPPC      
Related Party Transaction [Line Items]      
Due to affiliate 0 1,000,000  
Related party revenue 179,000,000 106,000,000 84,000,000
Receivables from affiliates 13,000,000 13,000,000  
Purchases from related party $ 43,000,000 $ 34,000,000 $ 25,000,000