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Related Party Transactions - PAC (Details) - PAC - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Affiliated entity | Intercompany administrative services agreement and a mutual assistance agreement      
Related Party Transaction [Line Items]      
SG&A expenses from transactions with related party $ 18 $ 10 $ 10
Due to affiliate 9 5  
Services provided to related parties 8 4 1
BHE      
Related Party Transaction [Line Items]      
Income tax receivable (payable), related parties current 48 25  
Cash (received from) paid to BHE for federal and state income taxes (120) 107 171
BHE | Wind turbine transactions      
Related Party Transaction [Line Items]      
Services provided to related parties 6    
Purchases from related party   147  
Subsidiary of Common Parent      
Related Party Transaction [Line Items]      
Purchases from related party 6 6 7
BNSF Railway Company      
Related Party Transaction [Line Items]      
Purchases from related party 19 29 35
Equity Method Investee      
Related Party Transaction [Line Items]      
Purchases from related party 148 145 $ 155
Due to related parties $ 7 $ 14