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Related Party Transactions - SPPC (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2022
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
SPPC | BHE        
Related Party Transaction [Line Items]        
SG&A expenses from transactions with related party   2,000,000 1,000,000 1,000,000
SPPC | NPC        
Related Party Transaction [Line Items]        
SG&A expenses from transactions with related party   25,000,000 26,000,000 26,000,000
Receivables from affiliates   0 0  
Due to affiliate   2,000,000 2,000,000  
Expense reimbursement   15,000,000 15,000,000 14,000,000
SPPC | NV Energy        
Related Party Transaction [Line Items]        
SG&A expenses from transactions with related party   5,000,000 5,000,000 4,000,000
Receivables from affiliates   0 0  
Due to affiliate   19,000,000 17,000,000  
Income tax receivable (payable), related parties current   0 7,000,000  
Related party, cash received (paid) for income taxes   3,000,000 (2,000,000) (37,000,000)
SPPC | Affiliated entity | Subsequent event | NV Energy        
Related Party Transaction [Line Items]        
Proceeds from contributions from affiliates $ 130,000,000      
SPPC | Distribution | NPC        
Related Party Transaction [Line Items]        
Related party revenue   43,000,000 34,000,000 25,000,000
Receivables from affiliates   0 1,000,000  
Purchases from related party   179,000,000 106,000,000 $ 84,000,000
Due to affiliate   $ 13,000,000 $ 13,000,000