Income Taxes - BHE (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
Jul. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income tax expense (benefit)		$ (777)	$ (1,213)	$ (1,194)	$ (1,571)
Pre-tax loss		146	1,895	(1,882)	(884)
Wildfire losses, net of recoveries		1,263	0	1,671	64
Income tax credit benefit		558	680
Effects of ratemaking, benefit		82
State income tax, net of federal income tax impacts, benefit		65
Loss on marketable securities		$ 76	3,270	$ (926)	$ 1,999
Federal statutory income tax rate, benefit			$ 398
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%)
Income tax effect of foreign income		9.00%	0.00%	1.00%	(4.00%)
Effects of ratemaking		56.00%	5.00%	(8.00%)	(18.00%)
Equity income		9.00%	0.00%	(2.00%)	(4.00%)
Noncontrolling interest		11.00%	2.00%	(4.00%)	(9.00%)
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
Long-term income tax receivable adjustments			$ 0		0
BYD Company Limited common stock
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Loss on marketable securities			3,259
Long-term Income Tax Receivable
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Long-term income tax receivable adjustments	$ (744)		(744)		(744)
Retained Earnings
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Long-term income tax receivable adjustments	$ 744		$ 744		$ 744

Effective Income Tax Rate Reconciliation, Regulatory Differences, Amount

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the tax effect of certain temporary differences due to state utility rate regulation.

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Long-term Income Tax Receivable, Adjustments

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Renewable Energy Production Tax Credits recognized during the period.

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Schedule of Effective Income Tax Rate Reconciliation [Line Items]

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The number of years from its in-service date that each wind-powered generating facility is eligible for federal renewable energy production tax credits.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Amount of realized and unrealized gain (loss) on investment.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).

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The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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