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Income Taxes - MEC (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
Income tax credits (108.00%) (35.00%)
State income tax, net of federal income tax impacts 0.00% (4.00%)
Effects of ratemaking (7.00%) (3.00%)
Effective income tax rate (104.00%) (17.00%)
Years eligible for federal renewable energy production tax credit 10 years  
Production tax credits $ 383,000,000 $ 343,000,000
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 (1158.00%) (518.00%)
State income tax, net of federal income tax impacts (11.00%) (18.00%)
Effects of ratemaking 0.00% (8.00%)
Other (5.00%) 2.00%
Effective income tax rate (1153.00%) (521.00%)
Years eligible for federal renewable energy production tax credit 10 years  
Production tax credits $ 220,000,000 $ 202,000,000
MEC | BHE    
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Related party transaction, cash received (paid) for income taxes $ 179,000,000 $ (1,000,000)