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Income Taxes - MEC (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Income tax credits (34.00%) (13.00%) (35.00%) (28.00%)
State income tax, net of federal income tax impacts 0.00% (1.00%) (2.00%) 0.00%
Effects of ratemaking (3.00%) (1.00%) (3.00%) (2.00%)
Other 0.00% 1.00% 0.00% 0.00%
Effective income tax rate (24.00%) 5.00% (21.00%) (13.00%)
Years eligible for federal renewable energy production tax credit     10 years  
Production tax credits     $ 700 $ 734
Related party transaction, cash received (paid) for income taxes     $ 864 $ 1,249
MEC        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Income tax credits (251.00%) (973.00%) (347.00%) (682.00%)
State income tax, net of federal income tax impacts (6.00%) (26.00%) (10.00%) (23.00%)
Effects of ratemaking (4.00%) (11.00%) (6.00%) (9.00%)
Other (2.00%) 0.00% (1.00%) 2.00%
Effective income tax rate (242.00%) (989.00%) (343.00%) (691.00%)
Years eligible for federal renewable energy production tax credit     10 years  
Production tax credits     $ 375 $ 388
MEC | BHE        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Related party transaction, cash received (paid) for income taxes     $ 520 $ 541