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Income Taxes - MEC (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
Income tax credits (35.00%) 72.00%
State income tax, net of federal income tax impacts (4.00%) (3.00%)
Effects of ratemaking (3.00%) 8.00%
Other 0.00% (1.00%)
Effective income tax rate (17.00%) 108.00%
Years eligible for federal renewable energy production tax credit 10 years  
Production tax credits $ 343,000,000 $ 338,000,000
Related party transaction, cash received (paid) for income taxes $ 0 $ 0
MEC    
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
Income tax credits (518.00%) (534.00%)
State income tax, net of federal income tax impacts (18.00%) (21.00%)
Effects of ratemaking (8.00%) (8.00%)
Other 2.00% 0.00%
Effective income tax rate (521.00%) (542.00%)
Years eligible for federal renewable energy production tax credit 10 years  
Production tax credits $ 202,000,000 $ 203,000,000
MEC | BHE    
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Related party transaction, cash received (paid) for income taxes $ (1,000,000) $ 0