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Income Taxes - MEC (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 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 382.00% 36.00% (67.00%) (165.00%)
State income tax, net of federal income tax impacts 44.00% 0.00% (5.00%) (2.00%)
Effects of ratemaking 56.00% 5.00% (8.00%) (18.00%)
Other 0.00% 0.00% 1.00% 3.00%
Effective income tax rate 532.00% 64.00% (63.00%) (178.00%)
Years eligible for federal renewable energy production tax credit     10 years  
Production tax credits     $ 1,258 $ 1,414
Related party transaction, cash received (paid) for income taxes     $ 1,000 $ 1,742
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 (47.00%) (69.00%) (142.00%) (222.00%)
State income tax, net of federal income tax impacts (8.00%) (21.00%) (9.00%) (21.00%)
Effects of ratemaking (5.00%) (13.00%) (5.00%) (12.00%)
Other (1.00%) 3.00% (1.00%) 1.00%
Effective income tax rate (40.00%) (79.00%) (136.00%) (233.00%)
Years eligible for federal renewable energy production tax credit     10 years  
Production tax credits     $ 484 $ 505
MEC | BHE        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Related party transaction, cash received (paid) for income taxes     $ 698 $ 757