Income Taxes - EEGH (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income tax, net of federal income tax impacts	(4.00%)	3.00%	0.00%	2.00%
Equity interest	0.00%	0.00%	(1.00%)	0.00%
Noncontrolling interest	(1.00%)	0.00%	(2.00%)	0.00%
Other	1.00%	0.00%	1.00%	0.00%
Effective income tax rate	(21.00%)	3.00%	(13.00%)	(2.00%)
EEGH
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income tax, net of federal income tax impacts	2.00%	(3.00%)	2.00%	(29.00%)
Equity interest	1.00%	0.00%	1.00%	8.00%
Effects of ratemaking	(1.00%)	(2.00%)	(1.00%)	(6.00%)
Change in tax status	0.00%	(18.00%)	0.00%	(24.00%)
AFUDC-equity	0.00%	0.00%	0.00%	(2.00%)
Noncontrolling interest	(11.00%)	(6.00%)	(11.00%)	(24.00%)
Write-off of regulatory assets	0.00%	0.00%	0.00%	9.00%
Other	0.00%	(2.00%)	1.00%	(1.00%)
Effective income tax rate	12.00%	(10.00%)	13.00%	(48.00%)
EEGH \| BHE
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Related party transaction, cash paid for (received) income taxes			$ (34)
EEGH \| Cove Point LNG, LP
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Ownership interest			75.00%	25.00%

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