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Related Party Transactions - MEC (Details) - USD ($)
$ in Millions
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 $ 1,504 $ 942
MEC | Affiliated entity      
Related Party Transaction [Line Items]      
Expense reimbursement 66 47 43
Due from affiliate, current 10 12  
Accounts payable to affiliates 17 13  
Affiliated notes receivable 124 146  
Due to affiliate, noncurrent 63 49  
MEC | BHE      
Related Party Transaction [Line Items]      
Related party expense 72 15 14
Income tax receivable (payable), related parties current 79 (14)  
Related party, cash received (paid) for income taxes 746 709 450
MEC | Northern Natural Gas and BNSF Railway Company      
Related Party Transaction [Line Items]      
Purchases from related party 132 $ 129 $ 139
MEC | BHE Renewables      
Related Party Transaction [Line Items]      
Purchases from related party $ 7