Income Taxes - MEC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
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	(50.00%)	(34.00%)	(67.00%)	(35.00%)
State income tax, net of federal income tax impacts	(2.00%)	0.00%	(1.00%)	(2.00%)
Effects of ratemaking	(3.00%)	(3.00%)	(4.00%)	(3.00%)
Other	1.00%	0.00%	(1.00%)	0.00%
Effective income tax rate	(38.00%)	(24.00%)	(58.00%)	(21.00%)
Years eligible for federal renewable energy production tax credit			10 years
Production tax credits			$ 771	$ 700
Related party transaction, cash received (paid) for income taxes			$ 851	$ 864
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	(892.00%)	(251.00%)	(1009.00%)	(347.00%)
State income tax, net of federal income tax impacts	(13.00%)	(6.00%)	(14.00%)	(10.00%)
Effects of ratemaking	0.00%	(4.00%)	(2.00%)	(6.00%)
Other	(4.00%)	(2.00%)	(1.00%)	(1.00%)
Effective income tax rate	(888.00%)	(242.00%)	(1005.00%)	(343.00%)
Years eligible for federal renewable energy production tax credit			10 years
Production tax credits			$ 434	$ 375
MEC | BHE
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Related party transaction, cash received (paid) for income taxes			$ 480	$ 520